@article{UFA_2014_6_4_a4,
     author = {I. V. Verevkin},
     title = {Generalized solutions and {Euler{\textendash}Darboux} transformations},
     journal = {Ufa mathematical journal},
     pages = {60--67},
     year = {2014},
     volume = {6},
     number = {4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/UFA_2014_6_4_a4/}
}