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(English).
In:
Fila, Marek, Handlovičová, A., Mikula, K., Medveď, Milan, Quittner, Pavol
and Ševčovič, Daniel (eds.): Proceedings of Equadiff 11, International Conference on Differential Equations. Czecho-Slovak series, Bratislava, July 25-29, 2005.
[Part 2] Minisymposia and contributed talks.
Comenius University Press, Bratislava, 2007.
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