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@article{MAN_1974__209_162582, author = {M. Breuer and R.S. Butcher}, title = {Fredholm {Theories} of {Mixed} {Type} with {Analytic} {Index} {Functions.}}, journal = {Mathematische Annalen}, pages = {31--42}, publisher = {mathdoc}, volume = {209}, year = {1974}, zbl = {0265.46057}, url = {http://geodesic.mathdoc.fr/item/MAN_1974__209_162582/} }
M. Breuer; R.S. Butcher. Fredholm Theories of Mixed Type with Analytic Index Functions.. Mathematische Annalen, Tome 209 (1974), pp. 31-42. http://geodesic.mathdoc.fr/item/MAN_1974__209_162582/