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© 2020 Peter Zach, Milada Holecová, Marek Brabec, Katarína Hollá, Miroslava Šebestová, Zdenka Martinková, Jiří Skuhrovec, Alois Honěk, Oldřich Nedvěd, Juraj Holec, Peter M.J. Brown, Miroslav Saniga, Terézia Jauschová, Ján Kulfan, published by Slovak Academy of Sciences, Mathematical Institute
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