@article{KUKZ_1983_19_19_a18,
     author = {S. B. Sagitova and E. A. Shirokova},
     title = {An inverse boundary value problem for the parameter~$\theta $},
     journal = {Trudy seminara po kraevym zada\v{c}am},
     pages = {175--184},
     publisher = {mathdoc},
     volume = {19},
     number = {19},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/KUKZ_1983_19_19_a18/}
}