@article{IJAMCS_2000_10_1_a8,
     author = {Covachev, V.},
     title = {Periodicity of the {Population} {Size} of an {Age-Dependent} {Model} {With} a {Dominant} {Age} {Class} by {Means} of {Impulsive} {Perturbations}},
     journal = {International Journal of Applied Mathematics and Computer Science},
     pages = {147--155},
     publisher = {mathdoc},
     volume = {10},
     number = {1},
     year = {2000},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IJAMCS_2000_10_1_a8/}
}