@article{ZNSL_1976_62_a6,
     author = {N. S. Grigor'ev},
     title = {Uniform asymptotic expansions of solutions of the {Mathieu} equation and the modified {Mathieu} equation},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {60--91},
     publisher = {mathdoc},
     volume = {62},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1976_62_a6/}
}