@article{MZM_1993_53_4_a7,
     author = {B. M. Levitan and A. \'E. Mamatov},
     title = {An estimate of the {Cauchy} matrix function for the dirac system in the case of finite-gap nonperiodic potentials},
     journal = {Matemati\v{c}eskie zametki},
     pages = {62--76},
     publisher = {mathdoc},
     volume = {53},
     number = {4},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1993_53_4_a7/}
}