@article{MABA_2011_25_1-2_a6,
     author = {E. Perez},
     title = {Long {Time} {Approximations} for {Solution} of {Evolution} {Equations} from {Quasimodes:} {Perturbation} {Problems}},
     journal = {Mathematica balkanica},
     pages = {95},
     publisher = {mathdoc},
     volume = {25},
     number = {1-2},
     year = {2011},
     url = {http://geodesic.mathdoc.fr/item/MABA_2011_25_1-2_a6/}
}