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(English).
In:
Krbec, Miroslav, Kufner, Alois, Opic, Bohumír
and Rákosník, Jiří (eds.): Nonlinear Analysis, Function Spaces and Applications, Proceedings of the Spring School held in Roudnice nad Labem, 1990.
Vol. 4.
B. G. Teubner Verlagsgesellschaft, Leipzig, 1990.
pp. 149-179
