F. Balfourier and G. Charmet, Geographic patterns of isozyme variation in Mediterranean populations of perennial ryegrass, Heredity, vol.72, pp.55-63, 1994.

D. G. Barker, S. Bianchi, F. Blondon, Y. Dattée, G. Duc et al.,

P. Genier, P. Guy, X. Muel, J. Tourneur, J. D6nari6 et al., Medicago truncatula, a model plant for studying the molecular genetics of the Rhizobium-legume symbiosis, Plant Mol. Biol. Rep, vol.8, pp.40-49, 1990.
URL : https://hal.archives-ouvertes.fr/hal-02704728

D. H. Basigalup, D. K. Barnes, and R. E. Stucker, Development of a core collection for perennial Medicago plant introductions, Crop Sci, vol.35, pp.1163-1168, 1995.

R. A. Becker, J. M. Chambers, A. R. Wilks, L. Bonnin, T. Huguet et al., High level of polymorphism and spatial structure in a selfing plant species, Medicago truncatula (Leguminosae), shown using RAPD markers, Am. J. Bot, vol.83, pp.843-855, 1988.

I. Bonnin, J. M. Prosperi, and I. Olivieri, Genetic markers and quantitative genetic variation in Medicago truncatula (Leguminosae): a comparative analysis of population structure, Genetics, vol.143, pp.1795-1805, 1996.
URL : https://hal.archives-ouvertes.fr/halsde-00336458

A. H. Brown, The case for core collection

D. R. Marshall and J. Williams, The Use of Plant Genetic Resources, pp.136-156, 1989.

A. H. Brown, Core collection: a practical approach to genetic resources management, Genome, vol.31, pp.818-824, 1989.

A. H. Brown, Core Collection of Plant Genetic Resources, pp.77-92, 1995.

A. H. Brown, J. P. Grace, and S. S. Speer, Designation of a &dquo;core&dquo; collection of perennial Glycine, Soybean Genetics Newsletter, vol.14, pp.59-70, 1987.

M. D. Casler, Patterns of variation in a collection of perennial ryegrass accessions, Crop Sci, vol.35, pp.1169-1177, 1995.

G. Charmet and F. Balfourier, Collecte et evaluation de populations naturelles de ray grass anglais en France, C.R. Acad. Agric. Fr, vol.77, pp.53-64, 1991.
URL : https://hal.archives-ouvertes.fr/hal-02701221

G. Charmet and F. Balfourier, The use of geostatistics for sampling a core collection of perennial ryegrass populations, Genet. Res. Crop Evol, vol.42, pp.303-309, 1995.
URL : https://hal.archives-ouvertes.fr/hal-02701254

G. Charmet, F. Balfourier, and A. Bion, Agronomic evaluation of a collection of French perennial ryegrass populations: multivariate analysis using genotype x environment interactions, Agronomie, vol.10, pp.807-823, 1990.

G. Charmet, F. Balfourier, and P. Monestiez, Hierarchical clustering of perennial ryegrass populations with geographic contiguity constraint, Theor. Appl. Genet, vol.88, pp.42-48, 1994.
URL : https://hal.archives-ouvertes.fr/hal-02708232

E. Chaulet and J. M. Prosperi, Genetic diversity of Medicago truncatula Gaertn collected in Algeria, Proceedings of the 7th Genetic Resources section meeting of Eucarpia, pp.255-257, 1994.

C. M. Cordeiro, E. A. Morales, P. Ferreira, D. M. Rocha, I. R. Costa et al., Towards a Brazilian core collection of cassava, Core Collection of Plant Genetic Resources, pp.155-168, 1995.

N. Cressie, Statistics for Spatial Data, 1991.

J. Crossa, D. Lacy, I. H. Taba, and S. , The use of multivariate methods in developing a core collection, pp.77-92, 1995.

N. Diwan, G. R. Bauchan, and M. S. Mcintosh, A core collection for the United States annual Medicago germplasm collection, Crop Sci, vol.34, pp.279-285, 1994.

N. Diwan, M. S. Mcintosh, and G. R. Bauchan, Methods of developing a core collection of annual Medicago species, Theor. Appl. Genet, vol.90, pp.755-761, 1995.

W. Erksine and F. J. Muehlbauer, Allozyme and morphological variability, outcrossing rate and core collection formation in lentil germplasm, Theor. Appl. Genet, vol.83, 1991.

O. H. Frankel, Genetic perspectives of germplasm conservation

N. W. Galwey, Verifying and validating the representativeness of a core collection, Genetic Manipulation: Impact on Man and Society, pp.187-198, 1984.

T. Gass, R. Sackville-hamilton, K. Kolshus, and E. Frison, Report of a working group on forages. Fifth Meeting of ECP/GR working group, 2002.

I. April, . Rome, . Italy, M. Goulard, and M. Voltz, Linear coregionalization model: tools for estimation and choice of cross-variogram matrix, Math. Geol, vol.24, issue.3, pp.269-286, 1992.

S. Hamon, T. Hodgkin, S. Dussert, F. Anthony, and M. Noirot, Proceedings of the 7th Genetic Resources section meeting of Eucarpia, pp.73-82, 1994.

S. Hamon, M. Noirot, and F. Antony, Developing a coffee core collection using the principal components score strategy with quantitative data, Core Collection of Plant Genetic Resources, pp.117-126, 1995.

T. L. Hintum and . Van, Comparison of marker systems and construction of a core collection in a pedigree of European barley, Theor. Appl. Genet, vol.89, pp.991-997, 1994.

T. L. Hintum, . Van, and D. Haalman, Pedigree analysis for composing a core collection of modern cultivars, with examples from barley (Hordeum vulgare s. lat.), Theor. Appl. Genet, vol.88, pp.70-74, 1994.

T. L. Hintum, . Van, R. Bothmer, . Von, and D. L. Visser, Sampling strategies for composing a core collection of cultivated barley (Hordeum vulgare S. lat.) collected in China, Hereditas, vol.122, pp.7-17, 1995.

C. C. Holbrook, W. F. Anderson, and R. N. Pittman, Selection of a core collection from the U.S. germplasm collection of peanut, Crop Sci, vol.33, pp.859-861, 1993.

B. P. Loos, P. J. Duin, and . Van, Establishing a core collection representing genetic variation in tulip, Plant Genetic Resources Newsletter, pp.11-12, 1989.

P. Monestiez, M. Goulard, and G. Charmet, Geostatistics for spatial genetic structure: study of wild populations of perennial ryegrass, Theor. Appl. Genet, vol.88, pp.33-41, 1994.

P. Monestiez, M. Goulard, G. Charmet, and F. Balfourier, Analysing spatial genetic structures by multivariate geostatistics: study of wild populations of perennial ryegrass, Geostatistics Wollongong, vol.2, pp.1197-1208, 1997.
URL : https://hal.archives-ouvertes.fr/hal-02766208

M. Nei, F-statistics and analysis of gene diversity in subdivided populations, Ann. Hum. Genet, vol.41, pp.225-233, 1977.

M. Noirot, S. Hamon, and F. Anthony, The principal component scoring: a new method of constituting a core collection using quantitative data, Genet. Res. Crop Evol, p.43

J. P. Peeters and J. A. Martinelli, Hierarchical cluster analysis as a tool to manage variation in germplasm collection, Theor. Appl. Genet, vol.78, pp.42-48, 1989.

J. M. Prosperi, P. Boumard, M. Angevain, and P. Mansat, Répartition et adaptation écotypique de Medicago spp. annuelles en Méditerranée occidentale, Proceedings of IV International Congress of Rangelands, pp.413-416, 1991.

J. M. Prosperi, M. Angevain, I. Bonnin, E. Chaulet, G. Genier et al.,

L. Olivieri and J. Ronfort, Genetic diversity, preservation and use of genetic resources of Mediterranean legumes: Alfalfa and Medics, Cah. Options Méditerranéennes, vol.18, pp.71-89, 1996.

G. Radovic and D. Jelovac, The possible approach in maize 'core collection' development, Proceedings of the 7th Genetic Resources section meeting of Eucarpia, pp.109-115, 1994.

C. E. Shannon, W. Weaver, D. J. Schoen, and A. H. Brown, Maximising genetic diversity in core collections of wild relatives of crop species, 1963.

, Core Collection of Plant Genetic Resources, pp.55-77, 1995.

P. L. Spagnoletti-zeuli and C. O. Qualset, Evaluation of five strategies for obtaining a core subset from a large genetic resource collection of durum wheat, Theor. Appl. Genet, vol.87, pp.295-304, 1993.

J. Tohme, P. Jones, S. Beebe, and M. Iwanaga, The combined use of agroecological and characterization data to establish the CIAT Phaseolus vulgaris core collection, Core Collection of Plant Genetic Resources, pp.95-107, 1995.

H. Wackernagel, M. Geostatistics-;-yonezawa, K. Nomura, T. Morishima, and H. , Sampling strategies for use in stratified germplasm collections, Core Collection of Plant Genetic Resources, pp.35-53, 1995.