@article{10_21136_CPMF_1938_120801,
     author = {Hlav\'a\v{c}ek, Miloslav},
     title = {K \v{r}e\v{s}eni $x^4-y^4=z^4-u^4$ cel\'ymi \v{c}{\'\i}sly},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky a fysiky},
     pages = {1--D4},
     year = {1938},
     volume = {67},
     number = {Suppl.},
     doi = {10.21136/CPMF.1938.120801},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPMF.1938.120801/}
}