@article{MZM_2017_102_2_a3,
     author = {A. S. Ivanov and A. M. Savchuk},
     title = {Trace of {Order~}$(-1)$ for a {String} with {Singular} {Weight}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {197--215},
     publisher = {mathdoc},
     volume = {102},
     number = {2},
     year = {2017},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2017_102_2_a3/}
}