@article{FAA_1986_20_4_a10,
     author = {D. I. Gurevich},
     title = {Elements of formal {Lie} theory and the {Poincar\'e--Birkhoff--Witt} theorem for generalized shift operators},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {72--73},
     publisher = {mathdoc},
     volume = {20},
     number = {4},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1986_20_4_a10/}
}