@article{MEM_2012_41_1_a17,
     author = {Karandzhulov, Lyudmil and Sirakova, Neli},
     title = {Asymptotic {Expansion} of {Solution} for {Almost} {Regular} and {Weakly} {Perturbed} {Systems} of {Ordinary} {Differential} {Equations}},
     journal = {Mathematics and Education in Mathematics},
     pages = {185--190},
     publisher = {mathdoc},
     volume = {41},
     number = {1},
     year = {2012},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MEM_2012_41_1_a17/}
}