Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{CMH_1971__46_139462, author = {Wolfgang Wasow}, title = {The {Central} {Connection} {Problem} at {Turning} {Points} of {Linear} {Differential} {Equations}}, journal = {Commentarii mathematici Helvetici}, pages = {65--86}, publisher = {mathdoc}, volume = {46}, year = {1971}, zbl = {0211.11001}, url = {http://geodesic.mathdoc.fr/item/CMH_1971__46_139462/} }
Wolfgang Wasow. The Central Connection Problem at Turning Points of Linear Differential Equations. Commentarii mathematici Helvetici, Tome 46 (1971), pp. 65-86. http://geodesic.mathdoc.fr/item/CMH_1971__46_139462/