TY  - JOUR
AU  - Pullman, N.
TI  - On the Number of Positive Entries in the Powers of a Non-Negative Matrix
JO  - Canadian mathematical bulletin
PY  - 1964
SP  - 525
EP  - 537
VL  - 7
IS  - 4
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1964-049-x/
DO  - 10.4153/CMB-1964-049-x
ID  - 10_4153_CMB_1964_049_x
ER  -