| Avaa | Nygaard, Gunnar
| Hydrobiological studies on some Danish ponds and lakes, Part II: the quotient hypothesis and some new or little known phytoplankton organisms | | kirja | hydrobiologia, hydrologia, limnologia | I Komission hos Ejnar Munksgaard | Köbenhavn | 1949 | 293 | | | | H-Limnologia, isokokoiset |