@article{PMFA_1980_25_3_a0,
     author = {Hajkr, Old\v{r}ich},
     title = {N\v{e}kter\'e sou\v{c}asn\'e v\v{e}deck\'e a technick\'e \'ukoly v hornick\'ych a hutnick\'ych oborech},
     journal = {Pokroky matematiky, fyziky a astronomie},
     pages = {121--128},
     year = {1980},
     volume = {25},
     number = {3},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/PMFA_1980_25_3_a0/}
}