R. Y.  Berg, ?Adaptation and evolution in Dicentra (Fumariaceae), with special reference to seed, fruit, and dispersal mechanism?, Nytt Mag. Bot., vol. 16, pp. 49 - 75, 1969.

{R. Y. } Berg, ?Adaptation and evolution in Dicentra (Fumariaceae), with special reference to seed, fruit, and dispersal mechanism?, Nytt Mag. Bot., vol. 16, pp. 49?75, 1969.