@article{01140287,
title = {A subset of metric preserving functions.},
journal = {International Journal of Mathematics and Mathematical Sciences},
volume = {21},
year = {1998},
pages = {409-410},
doi = {10.1155/S0161171298000568},
zbl = {0895.54017},
language = {en},
url = {http://dml.mathdoc.fr/item/01140287}
}
Vallin, Robert W. A subset of metric preserving functions.. International Journal of Mathematics and Mathematical Sciences, Tome 21 (1998) pp. 409-410. doi : 10.1155/S0161171298000568. http://gdmltest.u-ga.fr/item/01140287/