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     {\it Programs and Algorithms of Numerical Mathematics~19} \\
     J.~Chleboun, P.~K{\r{u}}s, P.~P{\v r}ikryl, M.~Rozlo{\v z}n{\'\i}k, K.~Segeth, J.~{\v S}{\'\i}stek, T.~Vejchodsk{\' y} (Eds.) \\
     Institute of Mathematics CAS, Prague 2019\\
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% konec