@article{ZNSL_1972_27_a4,
     author = {V. S. Buslaev},
     title = {On trace formulas in multi-canal problems},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {47--66},
     year = {1972},
     volume = {27},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1972_27_a4/}
}