@article{DAN_1991_320_1_a5,
     author = {V. L. Makarov},
     title = {A functional-difference method of arbitrary order of accuracy for solving the {Sturm--Liouville} problem with piecewise-smooth coefficients},
     journal = {Doklady Akademii Nauk},
     pages = {34--39},
     publisher = {mathdoc},
     volume = {320},
     number = {1},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1991_320_1_a5/}
}