@article{MZM_1999_66_3_a3,
     author = {A. V. Glushak},
     title = {Regular and singular perturbations of an abstract {Euler--Poisson--Darboux} equation},
     journal = {Matemati\v{c}eskie zametki},
     pages = {364--371},
     publisher = {mathdoc},
     volume = {66},
     number = {3},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1999_66_3_a3/}
}