@article{GDZPPN002230844, title = {On the sum ... D(n) ... (n + N).}, journal = {Manuscripta mathematica}, volume = {67}, year = {1990}, pages = {367-378}, zbl = {0721.11036}, url = {http://dml.mathdoc.fr/item/GDZPPN002230844} }
Balakrishnan, U.; Sengupta, J. On the sum ... D(n) ... (n + N).. Manuscripta mathematica, Tome 67 (1990) pp. 367-378. http://gdmltest.u-ga.fr/item/GDZPPN002230844/