additional sourceEvitt, W. R.; Damassa, S. P.; Albert, N. R. (1998). A tiger by the tail: The exophragm of the CretaceousâPaleocene dinoflagellate Palaeoperidinium and its implications. <em>Palynology.</em> 22(1): 1-55., available online athttps://doi.org/10.1080/01916122.1998.9989501[details]