Matsuoka et al., 2009
From dinoflaj3
Matsuoka, K., Kawami, H., Nagai, S., Iwataki, M. and Takayama, H., 2009: Re-examination of cyst-motile relationships of Polykrikos kofoidii Chatton and Polykrikos schwartzii Bütschli (Gymnodiniales, Dinophyceae). Review of Palaeobotany and Palynology, v.154, p.74-90.