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@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/} }
H. W. Pu; J. P. Spencer. A proof of J. Mařík's lemma. Colloquium Mathematicum, Tome 24 (1971) no. 1, pp. 85-88. doi : 10.4064/cm-24-1-85-88. http://geodesic.mathdoc.fr/articles/10.4064/cm-24-1-85-88/
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