@article{10_4153_CMB_1969_109_6,
     author = {Baker, John A.},
     title = {An {Analogue} of the {Wave} {Equation} and {Certain} {Related} {Functional} {Equations}},
     journal = {Canadian mathematical bulletin},
     pages = {837--846},
     year = {1969},
     volume = {12},
     number = {6},
     doi = {10.4153/CMB-1969-109-6},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1969-109-6/}
}