@article{oai:repository.dl.itc.u-tokyo.ac.jp:00039666, author = {Okamoto, Kazuo}, issue = {3}, journal = {Journal of the Faculty of Science, the University of Tokyo. Sect. 1 A, Mathematics = 東京大学理学部紀要. 第1類A, 数学}, month = {Dec}, pages = {501--518}, title = {Deformation d'une equation differentielle lineaire avec une singularite irreguliere sur un tore}, volume = {26}, year = {1979} }