@article{oai:repository.dl.itc.u-tokyo.ac.jp:00039895, author = {Ochiai, Takushiro}, issue = {2}, journal = {Journal of the Faculty of Science, University of Tokyo. Sect. 1, Mathematics, astronomy, physics, chemistry = 東京大學理學部紀要. 第1類, 數學, 天文學, 物理學, 化學}, month = {Mar}, note = {application/pdf}, pages = {231--234}, title = {A lemma on open convex cones}, volume = {12}, year = {1966} }