The flowering locus Hr colocalizes with a major QTL affecting winter frost tolerance in Pisum sativum L. - Lejeune-Hénaut, I.; Hanocq, E.; Béthencourt, L.; Fontaine, V.; Delbreil, B.; Morin, J.; Petit, A.; Devaux, R.; Boilleau, M.; Stempniak, J.-J.; Thomas, M.; Lainé, A.-L.; et al. (Theoretical & Applied Genetics, 2008)