@article{701229,
     title = {Applications of ultrapowers and Lipschitz classification of Banach spaces},
     booktitle = {Abstracta. 9th Winter School on Abstract Analysis},
     series = {GDML\_Books},
     publisher = {Czechoslovak Academy of Sciences},
     address = {Praha},
     year = {1981},
     pages = {70-76},
     url = {http://dml.mathdoc.fr/item/701229}
}

Heinrich, S.; Mankiewicz, P. Applications of ultrapowers and Lipschitz classification of Banach spaces, dans Abstracta. 9th Winter School on Abstract Analysis, GDML_Books,  (1981), pp. 70-76. http://gdmltest.u-ga.fr/item/701229/