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@article{SF_1974__9_134069, author = {K. Takizawa}, title = {Notes on {{Oa}-bands} of groupoids.}, journal = {Semigroup forum}, pages = {155--158}, publisher = {mathdoc}, volume = {9}, year = {1974}, zbl = {0289.06018}, url = {http://geodesic.mathdoc.fr/item/SF_1974__9_134069/} }
K. Takizawa. Notes on {Oa}-bands of groupoids.. Semigroup forum, Tome 9 (1974), pp. 155-158. http://geodesic.mathdoc.fr/item/SF_1974__9_134069/