@article{LJM_2001_8_a2,
     author = {B. B. Komrakov},
     title = {Einstein{\textendash}Maxwell equation on four-dimensional homogeneous spaces},
     journal = {Lobachevskii journal of mathematics},
     pages = {33--165},
     year = {2001},
     volume = {8},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/LJM_2001_8_a2/}
}