@article{IM2_2020_84_2_a2,
     author = {V. F. Butuzov},
     title = {On singularly perturbed systems {of~ODE} with a~multiple root of~the degenerate equation},
     journal = {Izvestiya. Mathematics },
     pages = {262--290},
     publisher = {mathdoc},
     volume = {84},
     number = {2},
     year = {2020},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2020_84_2_a2/}
}