@article{10_1017_S0017089500006674,
     author = {Lowndes, J. S.},
     title = {On some solutions of second order hyperbolic differential equations with constant coefficients},
     journal = {Glasgow mathematical journal},
     pages = {69--72},
     year = {1987},
     volume = {29},
     number = {1},
     doi = {10.1017/S0017089500006674},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500006674/}
}