[1] Chao C. Y.:
On a conjecture of the semigroup of fully indecomposable relations. Czechoslovak Math. J., 27 (1977), 591-597.
MR 0450067 |
Zbl 0384.20051
[4] Schwarz Š.:
The semigroup of fully indecomposable relations and Hall relations. Czechoslovak Math. J., 23 (1973), 151-163.
MR 0316612 |
Zbl 0261.20057
[5] Schwarz Š.:
A new approach to some problems in the theory of nonnegative matrices. Czechoslovak Math. J., 16 (1966), 274-283.
MR 0201452