TY  - JOUR
AU  - Shapiro, H.S.
TI  - On a class of extremal problems for polynomials in the unit circle
JO  - Portugaliae mathematica
PY  - 1961
SP  - 67
EP  - 93
VL  - 20
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/PORMA_1961__20_2_114854/
LA  - en
ID  - PORMA_1961__20_2_114854
ER  -