@article{BMMS_2007_30_1_a4,
     author = {Shyampada Modak and Chhanda Bandyopadhyay},
     title = {A {Note} on {\ensuremath{\psi}-Operator}},
     journal = {Bulletin of the Malaysian Mathematical Society},
     year = {2007},
     volume = {30},
     number = {1},
     url = {http://geodesic.mathdoc.fr/item/BMMS_2007_30_1_a4/}
}