@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.}
}
