@article{10_1017_S2040618500035620,
     author = {Piaggio, H. T. H.},
     title = {Exceptional {Integrals} of a not completely {Integrable} {Total} {Differential} {Equation}},
     journal = {Glasgow mathematical journal},
     pages = {137--138},
     year = {1953},
     volume = {1},
     number = {3},
     doi = {10.1017/S2040618500035620},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S2040618500035620/}
}