@article{701233,
     title = {Geometry of Banach spaces and solvability of nonlinear equations},
     booktitle = {Abstracta. 9th Winter School on Abstract Analysis},
     series = {GDML\_Books},
     publisher = {Czechoslovak Academy of Sciences},
     address = {Praha},
     year = {1981},
     pages = {95-100},
     url = {http://dml.mathdoc.fr/item/701233}
}

Kolomý, Josef. Geometry of Banach spaces and solvability of nonlinear equations, dans Abstracta. 9th Winter School on Abstract Analysis, GDML_Books,  (1981), pp. 95-100. http://gdmltest.u-ga.fr/item/701233/