@article{SJIM_2021_24_2_a0,
     author = {I. V. Boykov and V. A. Ryazantsev},
     title = {An approximate method for solving the inverse coefficient problem
},
     journal = {Sibirskij \v{z}urnal industrialʹnoj matematiki},
     pages = {5--22},
     publisher = {mathdoc},
     volume = {24},
     number = {2},
     year = {2021},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/SJIM_2021_24_2_a0/}
}