@article{UFA_2017_9_3_a13,
     author = {Yu. Z. Shaygardanov},
     title = {Asymptotics in  parameter of  solution to  elliptic boundary value problem in   vicinity of  outer touching of   characteristics to 
},
     journal = {Ufa mathematical journal},
     pages = {137--147},
     publisher = {mathdoc},
     volume = {9},
     number = {3},
     year = {2017},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/UFA_2017_9_3_a13/}
}