TY  - JOUR
AU  - F. Albiac
AU  - J. L. Ansorena
TI  - On a problem posed by M. M. Popov
JO  - Studia Mathematica
PY  - 2012
SP  - 247
EP  - 258
VL  - 211
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/sm211-3-6/
DO  - 10.4064/sm211-3-6
LA  - en
ID  - 10_4064_sm211_3_6
ER  -