@article{IM2_2017_81_3_a1,
     author = {V. F. Butuzov},
     title = {Asymptotic behaviour and stability of solutions of a~singularly perturbed elliptic problem with a~triple root of the degenerate equation},
     journal = {Izvestiya. Mathematics },
     pages = {481--504},
     publisher = {mathdoc},
     volume = {81},
     number = {3},
     year = {2017},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2017_81_3_a1/}
}