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@article{MAN_1988__282_2_164450, author = {Masaaki Yoshida and Takeshi Sasaki}, title = {Linear differential {Equations} in {Two} {Variables} of {Rank} {Four.} {I.}}, journal = {Mathematische Annalen}, pages = {69--94}, publisher = {mathdoc}, volume = {282}, number = {2}, year = {1988}, zbl = {0627.35014}, url = {http://geodesic.mathdoc.fr/item/MAN_1988__282_2_164450/} }
Masaaki Yoshida; Takeshi Sasaki. Linear differential Equations in Two Variables of Rank Four. I.. Mathematische Annalen, Tome 282 (1988) no. 2, pp. 69-94. http://geodesic.mathdoc.fr/item/MAN_1988__282_2_164450/