@article{TRSPY_2018_302_a15,
     author = {R. G. Novikov and I. A. Taimanov},
     title = {Darboux{\textendash}Moutard transformations and {Poincar\'e{\textendash}Steklov} operators},
     journal = {Informatics and Automation},
     pages = {334--342},
     year = {2018},
     volume = {302},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_2018_302_a15/}
}