@article{10_4064_cm_24_1_85_88,
     author = {H. W. Pu and J. P. Spencer},
     title = {A proof of {J.} {Ma\v{r}{\'\i}k's} lemma},
     journal = {Colloquium Mathematicum},
     pages = {85--88},
     publisher = {mathdoc},
     volume = {24},
     number = {1},
     year = {1971},
     doi = {10.4064/cm-24-1-85-88},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-24-1-85-88/}
}