@article{10_4153_S0008439519000249,
     author = {Koca, Caner and Lejmi, Mehdi},
     title = {Einstein{\textendash}Maxwell {Equations} on {Four-dimensional} {Lie} {Algebras}},
     journal = {Canadian mathematical bulletin},
     pages = {822--840},
     year = {2019},
     volume = {62},
     number = {4},
     doi = {10.4153/S0008439519000249},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/S0008439519000249/}
}