TY  - JOUR
AU  - Popescu, Gelu
TI  - Positive-Defininte Functions on Free Semigroups
JO  - Canadian journal of mathematics
PY  - 1996
SP  - 887
EP  - 896
VL  - 48
IS  - 4
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1996-045-3/
DO  - 10.4153/CJM-1996-045-3
ID  - 10_4153_CJM_1996_045_3
ER  -