1. Development of ovule, embryo sac, and endosperm in Brodiaea (Liliales);Berg R. Y.;Norweg. J. Bot.,1978
2. Contribution to the embryology of Muilla, with a remark on the taxonomic position of the genus;Berg R. Y.;Madroño,1966
3. Macrosporogenesis in Leucocoryne ixioides Lindl