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"Cronberg G, Lindmark G, Bj&ouml;rk S (1988) Mass development of the flagellate Gonyostomum semen (Raphidophyta) in Swedish forest lakes - an effect of acidification? Hydrobiologia 161 (1): 217&#8209;236.  https://doi.org/10.1007/bf00044113"
<https://bdj.pensoft.net/article/50451>