@article{bwmeta1.element.desklight-c01d0b51-0880-4a8f-aa6c-1d42e74e115e,
author = {H. W. Pu and J. P. Spencer},
title = {A proof of J. Ma\v r\'\i k's lemma},
journal = {Colloquium Mathematicae},
volume = {24},
year = {1971},
pages = {85-88},
zbl = {0223.28008},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.desklight-c01d0b51-0880-4a8f-aa6c-1d42e74e115e}
}
H. W. Pu; J. P. Spencer. A proof of J. Mařík's lemma. Colloquium Mathematicae, Tome 24 (1971) pp. 85-88. http://gdmltest.u-ga.fr/item/bwmeta1.element.desklight-c01d0b51-0880-4a8f-aa6c-1d42e74e115e/