@article{00750681,
title = {A new necessary condition for moduli of non-natural irreducible disjoint covering system.},
journal = {Acta Mathematica Universitatis Comenianae. New Series},
volume = {63},
year = {1994},
pages = {133-140},
zbl = {0822.11004},
language = {en},
url = {http://dml.mathdoc.fr/item/00750681}
}
Polách, I. A new necessary condition for moduli of non-natural irreducible disjoint covering system.. Acta Mathematica Universitatis Comenianae. New Series, Tome 63 (1994) pp. 133-140. http://gdmltest.u-ga.fr/item/00750681/