@ARTICLE{Czopek_Kazimierz_Budgeting_2001,
 author={Czopek, Kazimierz},
 number={No 1},
 journal={Archives of Mining Sciences},
 pages={67-83},
 howpublished={online},
 year={2001},
 publisher={Committee of Mining PAS},
 type={Article},
 title={Budgeting of the Mining Output Costs by Means of Dual Prograrmming},
 URL={http://journals.pan.pl/Content/132207/PDF/7_MINING_46_1_2001_Czopek_BUDGETING.pdf},
}