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(English).
In:
Brandts, J., Chleboun, J., Korotov, S., Segeth, K., Šístek, J.
and Vejchodský, T. (eds.): Applications of Mathematics 2012, In honor of the 60th birthday of Michal Křížek.
Proceedings. Prague, May 2-5, 2012.
Institute of Mathematics AS CR, Prague, 2012.
pp. 173-187
