Grain legume seed filling in relation to nitrogen acquisition: A review and prospects with particular reference to pea Christophe Salon, Nathalie G. Munier-Jolain, Gérard Duc, Anne-Sophie Voisin, David Grandgirard, Annabelle Larmure, Robert J.N. Emery and Bertrand NeyAgronomie, 21 6-7 (2001) 539-552DOI: https://doi.org/10.1051/agro:2001143