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Växtplanktonflora
Toini Tikkanen, Torbjörn Willén
Bok Svensk 1992
Vänern, Vättern, Mälaren, Hjälmaren - en oversikt
red. Torbjörn Willen
Bok Svensk 1975
Phytoplankton from Tvären, a bay of the Baltic, 1961-1963
Willén, Torbjörn
Bok Engelsk 1968
Phytoplankton from Lake Magelungen, central Sweden, 1960-1963
Willén, Torbjörn
Bok Engelsk 1966
Studies on the phytoplankton of some lakes connected with or recently isolated from the Baltic
Willén, Torbjörn
Bok Engelsk 1962
The Utål lake chain, Central Sweden, and its phytoplankton
Willén, Torbjörn
Bok Engelsk 1962