@article{AUPCM_2015_14_a3,
     author = {Banerjee, Abhijit and Chakraborty, Bikash},
     title = {Further investigations on a question of {Zhang} and {L\"u}},
     journal = {Annales Universitatis Paedagogicae Cracoviensis. Studia Mathematica},
     publisher = {mathdoc},
     number = {14},
     year = {2015},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUPCM_2015_14_a3/}
}