1. Introgressive Hybridization;Anderson,1949
2. Introgressive hybridization;Anderson;Biol. Rev,1953
3. Melandrium, (Roehling em.) Fries;Baker;J. Ecol.,1947
4. The ecospecies - prelude to discussion;Baker;Evolution,1952
5. Race formation and reproductive method in flowering plants;Baker;Symp. Soc. exp. Biol.,1953