@article{1183530568,
author = {Gray, Neil},
title = {A new characterization of $AR\left( \mathfrak{M} \right)$ and $ANR\left( \mathfrak{M} \right)$},
journal = {Bull. Amer. Math. Soc.},
volume = {75},
number = {5},
year = {1969},
pages = { 607-609},
language = {en},
url = {http://dml.mathdoc.fr/item/1183530568}
}
Gray, Neil. A new characterization of $AR\left( \mathfrak{M} \right)$ and $ANR\left( \mathfrak{M} \right)$. Bull. Amer. Math. Soc., Tome 75 (1969) no. 5, pp. 607-609. http://gdmltest.u-ga.fr/item/1183530568/