@article {151,
	title = {Ueber eine neue species von Ecteinascidia aus Formosa},
	journal = {Proceedings of the Imperial Academy of Tokyo},
	volume = {7},
	year = {1931},
	pages = {173-175},
	author = {Oka, A.}
}
@article {275,
	title = {Ein Beitrag zur Kenntnis der japanischen Botryllidae (Vorlaufige Mitteilung)},
	journal = {Proceedings of the Imperial Academy of Tokyo},
	volume = {39},
	year = {1927},
	pages = {607-609},
	author = {Oka, A.}
}
@article {374,
	title = {On the mode of gemmation in Dictyostyela depressa n.g. n.sp. (Ascidiae Sociales)},
	journal = {Proceedings of the Imperial Academy of Tokyo},
	volume = {2},
	year = {1926},
	pages = {348-351},
	author = {Oka, A.}
}
@article {403,
	title = {Sur un nouveau genre d{\textquoteright}ascidies simples ("Corelloides" nov. gen.)},
	journal = {Proceedings of the Imperial Academy of Tokyo},
	volume = {2},
	year = {1926},
	pages = {67-68},
	author = {Oka, A.}
}
