@article{GDZPPN00126110X,
title = {A maximal chain of principal ideals in the semigroup of binary relations on a finite set.},
journal = {Semigroup forum},
volume = {43},
year = {1991},
pages = {63-76},
zbl = {0727.20040},
url = {http://dml.mathdoc.fr/item/GDZPPN00126110X}
}
Breen, M. A maximal chain of principal ideals in the semigroup of binary relations on a finite set.. Semigroup forum, Tome 43 (1991) pp. 63-76. http://gdmltest.u-ga.fr/item/GDZPPN00126110X/