%0 Journal Article
%A Jerzy Kalina
%A Antoni Pierzchalski
%A Paweł Walczak
%T Only one of generalized gradients can be elliptic
%J Annales Polonici Mathematici
%D 1997
%P 111-120
%V 67
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.4064/ap-67-2-111-120/
%R 10.4064/ap-67-2-111-120
%G en
%F 10_4064_ap_67_2_111_120