Khowaja-Ateequzzaman et al., 1991
From dinoflaj3
Khowaja-Ateequzzaman, Garg, R. and Jain, K.P., 1991: Some observations on dinoflagellate cyst genus Alterbidinium Lentin and Williams 1985. The Palaeobotanist, v.39, no.1, p.37-45, pl.1-2.