@article{LJM_2005_18_a8,
     author = {E. A. Utkina},
     title = {On a partial differential equation in 4-dimensional {Euclidean} space},
     journal = {Lobachevskii journal of mathematics},
     pages = {151--175},
     publisher = {mathdoc},
     volume = {18},
     year = {2005},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/LJM_2005_18_a8/}
}