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The break-even point in the case of a curvilinear function of exploitation costs / K. CZOPEK // W: Mine planning and equipment selection 2004 : proceedings of the thirteenth international symposium on Mine planning and equipment selection : Wrocław, Poland, 1–3 September, 2004 / eds. Monika Hardygóra, Gabriela Paszkowska, Marek Sikora. — Leiden [etc.] : A. A. Balkema Publishers, 2004. — ISBN10: 0415359376. — S. 647–651. — Bibliogr. s. 651, Abstr.

Verification of economic efficiency of lignite deposit development using the sensitivity analysis / Beata TRZASKUŚ-ŻAK, Kazimierz CZOPEK // W: The mining Příbram symposium 2011 : the international sections: Mathematical methods in geology ; Geoethics : October 8–15, 2011, Příbram, Czech Republic : proceedings volume / eds. Václav Němec, Lidmila Němcová. — Příbram : Hornická Příbram ve vědě a technice, 2011. — Na okł.: 50. Ročník ZSDNP, Sympozia. — ISBN: 978-80-904993-1-7. — S. 1–9. — Bibliogr. s. 9, Abstr.. — Numeracja stron nieciągła