@article{MV_1973_25_1_a31,
     author = {A. Ivi\'c},
     title = {An asymptotic formula for elements of a semigroup of integers},
     journal = {Matemati\v{c}ki vesnik},
     pages = {255 },
     publisher = {mathdoc},
     volume = {25},
     number = {1},
     year = {1973},
     url = {http://geodesic.mathdoc.fr/item/MV_1973_25_1_a31/}
}