@article{CMFD_2019_65_1_a1,
     author = {M. V. Dolgopolov and I. N. Rodionova},
     title = {On formulation of modified problems for the {Euler--Darboux} equation with parameters equal to~$\dfrac{1}{2}$ in absolute value},
     journal = {Contemporary Mathematics. Fundamental Directions},
     pages = {11--20},
     publisher = {mathdoc},
     volume = {65},
     number = {1},
     year = {2019},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/CMFD_2019_65_1_a1/}
}