TY  - JOUR
AU  - Majumder, Sujoy
TI  - Further investigation “On an open problem of Zhang and Xu”
JO  - Mathematica Bohemica
PY  - 2018
SP  - 251
EP  - 275
VL  - 143
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.21136/MB.2017.0017-16/
DO  - 10.21136/MB.2017.0017-16
LA  - en
ID  - 10_21136_MB_2017_0017_16
ER  -