@article{10_21136_CPMF_1881_123969,
     author = {K\"upper, Karel},
     title = {Jednoduch\'e d\r{u}kazy n\v{e}kter\'ych v\v{e}t o kmenn\'ych \v{c}{\'\i}slech},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky a fysiky},
     pages = {10--20},
     publisher = {mathdoc},
     volume = {10},
     number = {1},
     year = {1881},
     doi = {10.21136/CPMF.1881.123969},
     language = {cz},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPMF.1881.123969/}
}