@article{MOMA_1967__71_177394,
     author = {C.V. Coffmann and D.F. Ullrich},
     title = {On the {Continuation} of {Solutions} of a {Certain} {Non-linear} {Differential} {Equation.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {385--392},
     publisher = {mathdoc},
     volume = {71},
     year = {1967},
     zbl = {0153.40204},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1967__71_177394/}
}