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@article{ARM_1969__5_3_a0, author = {Arscott, Felix M. and Wright, G. P.}, title = {Floquet theory for doubly-periodic differential equations}, journal = {Archivum mathematicum}, pages = {111--124}, publisher = {mathdoc}, volume = {05}, number = {3}, year = {1969}, mrnumber = {0330573}, zbl = {0235.34053}, language = {en}, url = {http://geodesic.mathdoc.fr/item/ARM_1969__5_3_a0/} }
Arscott, Felix M.; Wright, G. P. Floquet theory for doubly-periodic differential equations. Archivum mathematicum, Tome 05 (1969) no. 3, pp. 111-124. http://geodesic.mathdoc.fr/item/ARM_1969__5_3_a0/