海量图书期刊资源,随时随地畅享阅读乐趣
Apomixis in the angiosperms. IIAxel Nygren · 1954
INVESTIGATIONS ON NORTH AMERICAN CALAMAGROSTIS. IAXEL NYGREN · 1954
Cytological studies in Gadidae (Pisces)AXEL NYGREN; GERT BERGKVIST; TORGNY WINDAHL; GUN JAHNKE · 1974
Cytological studies in Cyprinidae (Pisces)AXEL NYGREN; JAN ANDREASSON; LAILA JONSSON; GUN JAHNKE · 1975
STUDIES ON VIVIPARY IN THE GENUS DESCHAMPSIAAXEL NYGREN · 1949
APOMICTIC AND SEXUAL REPRODUCTION IN CALAMAGROSTIS PURPUREAAXEL NYGREN · 1949
FORM AND BIOTYPE FORMATION IN CALAMAGROSTIS PURPUREAAXEL NYGREN · 1951
Cytological studies in Hypotremata and Pleurotremata (Pisces)AXEL NYGREN; BIRGIT NILSSON; MARGARETE JAHNKE · 1971