@article{10_21136_AM_1970_103265,
     author = {Hor\'alek, Vratislav},
     title = {On the moments in nonhomogeneous birth, immigration and death processes},
     journal = {Applications of Mathematics},
     pages = {31--40},
     publisher = {mathdoc},
     volume = {15},
     number = {1},
     year = {1970},
     doi = {10.21136/AM.1970.103265},
     mrnumber = {0256472},
     zbl = {0201.21502},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/AM.1970.103265/}
}