@article {1782,
	title = {Ueber eine Cystodites-Art aus Japan},
	journal = {Proceedings of the Imperial Academy, Tokyo},
	volume = {5},
	year = {1929},
	pages = {480-482},
	author = {Oka, A.}
}
@article {1781,
	title = {Uber einen neuen Culeolus aus dem westlichen Pazifik},
	journal = {Proceedings of the Imperial Academy, Tokyo},
	volume = {4},
	year = {1928},
	pages = {226-228},
	author = {Oka, A.}
}
@article {1780,
	title = {Ueber eine neue gestielte Monascidie Podocynthia turboja n.g. n.sp.},
	journal = {Proceedings of the Imperial Academy , Tokyo},
	volume = {5},
	year = {1929},
	pages = {94-96},
	author = {Oka, A.}
}
@article {1764,
	title = {Report upon the Tunicata in the collection of the Indian Museum},
	journal = {Memoirs of the Indian Museum},
	volume = {6},
	year = {1915},
	pages = {1-33},
	author = {Oka, A.}
}
@article {1733,
	title = {Notizen uber japaniche Ascidien, II},
	journal = {Annotationes Zoologicae Japonenses},
	volume = {8},
	year = {1914},
	pages = {443-458},
	author = {Oka, A.}
}
@article {1705,
	title = {Ueber Clavelina coerulea n. sp., die erst von Japan bekannt gewordene Clavellina},
	journal = {Proceedings of the Imperial Academy of Japan},
	volume = {10},
	year = {1934},
	pages = {365-366},
	author = {Oka, A.}
}
@article {1704,
	title = {Ueber Clavelina coerulea n. sp., die erst von Japan bekannt gewordene Clavellina},
	journal = {Proceedings of the Imperial Academy of Japan},
	volume = {10},
	year = {1934},
	pages = {365-366},
	author = {Oka, A.}
}
@article {1671,
	title = {Eine zweite japanische Art der Gattung Agnesia},
	journal = {Proceedings of the Imperial Academy of Japan},
	volume = {5},
	year = {1929},
	pages = {152-154},
	author = {Oka, A.}
}
@article {1670,
	title = {Ueber eine neue stachelige Cynthia-Art aus Sagami Bucht},
	journal = {Proceedings of the Imperial Academy of Japan},
	volume = {8},
	year = {1932},
	pages = {131-134},
	author = {Oka, A.}
}
@article {1664,
	title = {Ueber eine merkwurdige Botryllus-Art, B. primigenus nov. sp.},
	journal = {Proceedings of the Imperial Academy of Japan},
	volume = {4},
	year = {1928},
	pages = {303-305},
	author = {Oka, A.}
}
@article {385,
	title = {Die periodische regeneration der oberen Korperhalfte bei den Diplosomiden},
	journal = {Biologisches Centralblatt},
	volume = {12},
	year = {1892},
	pages = {265-268},
	author = {Oka, A.}
}
@article {401,
	title = {Ein neuer Fall von der Ausstossung der Eingeweide bei den Ascidien},
	journal = {Annotationes Zoologicae Japonensis},
	volume = {9},
	year = {1918},
	pages = {393-397},
	author = {Oka, A.}
}
@article {320,
	title = {Zur Kenntnis der zwei aberranten Ascidie igattungen Dicopia Sluit. und Hexacrobylus Sluit.},
	journal = {Zoologischer Anzeiger},
	volume = {43},
	number = {1-4},
	year = {1913},
	pages = {1-10},
	author = {Oka, A.}
}
@article {417,
	title = {Notizen uber japanische ascidien 1},
	journal = {Annotationes Zoologicae Japonensis},
	volume = {6},
	number = {1},
	year = {1906},
	pages = {37-52},
	author = {Oka, A.}
}
@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 {386,
	title = {Ueber eine neue langgestielte Synascidie aus der Bucht von Sagami},
	journal = {Proceedings of the Imperial Academy of Japan},
	volume = {6},
	year = {1930},
	pages = {205-207},
	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.}
}
@article {408,
	title = {Report of the Biological Survey of Mutsu Bay 28. Ascidiae Simplices},
	journal = {Scientific Reports. Research Institutes Tohoku University},
	volume = {10},
	number = {4},
	year = {1935},
	pages = {428-466},
	author = {Oka, A.}
}
