@article{10_21136_CPMF_1941_121812,
     author = {Lerl, Karel},
     title = {O sb{\'\i}rk\'ach \'uloh},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky a fysiky},
     pages = {287--D289},
     year = {1941},
     volume = {70},
     number = {Suppl.},
     doi = {10.21136/CPMF.1941.121812},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPMF.1941.121812/}
}