@article{MZ_1974__136_172030,
     author = {C.A. Stuart},
     title = {Concave {Solutions} of {Singular} {Non-linear} {Differential} {Equations.}},
     journal = {Mathematische Zeitschrift},
     pages = {117--136},
     publisher = {mathdoc},
     volume = {136},
     year = {1974},
     zbl = {0281.47040},
     url = {http://geodesic.mathdoc.fr/item/MZ_1974__136_172030/}
}