@article{VMUMM_1987_6_a3,
     author = {V. A. Lyubishkin and I. D. Tsopanov},
     title = {New trace formulas for operators with a discrete spectrum},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {22--25},
     publisher = {mathdoc},
     number = {6},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1987_6_a3/}
}