Feist-Burkhardt and Monteil, 1994
From dinoflaj2
Feist-Burkhardt, S. and Monteil, E., 1994: Wallodinium cylindricum and Wallodinium elongatum: stratigraphical problem and taxonomical solution. Cahiers de micropaléontologie, Nouvelle série, v.9, no.3, p.5-15, pl.1-5.