@article{01538434,
title = {A proper subclass of MacLane's class },
journal = {International Journal of Mathematics and Mathematical Sciences},
volume = {22},
year = {1999},
pages = {463-468},
doi = {10.1155/S0161171299224635},
zbl = {0966.30025},
language = {en},
url = {http://dml.mathdoc.fr/item/01538434}
}
Hamdan, May. A proper subclass of MacLane's class . International Journal of Mathematics and Mathematical Sciences, Tome 22 (1999) pp. 463-468. doi : 10.1155/S0161171299224635. http://gdmltest.u-ga.fr/item/01538434/