@article{NSJOM_1980_10_Nonea_7,
     author = {Pilipovi\'c Stevan and Taka\v{c}i Arpad},
     title = {Convolutions in the countable union 

 of exponential distributions},
     journal = {Novi Sad Journal of Mathematics},
     pages = {63-70},
     publisher = {mathdoc},
     volume = {10},
     year = {1980},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_1980_10_Nonea_7/}
}