@article{SIGMA_2015_11_a9,
     author = {Bernd Fritzsche and Bernd Kirstein and Inna Ya. Roitberg and Alexander L. Sakhnovich},
     title = {Pseudo-Exponential-Type {Solutions} of {Wave} {Equations} {Depending} {on~Several} {Variables}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2015},
     volume = {11},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2015_11_a9/}
}