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(English).
In:
Brandts, J., Korotov, S., Křížek, M., Šístek, J.
and Vejchodský, T. (eds.): Applications of Mathematics 2013, In honor of the 70th birthday of Karel Segeth.
Proceedings. Prague, May 15-17, 2013.
Institute of Mathematics AS CR, Prague, 2013.
pp. 21-32