@article{1195517435,
author = {Graef, John R.},
title = {Limit circle type criteria for nonlinear differential equations},
journal = {Proc. Japan Acad. Ser. A Math. Sci.},
volume = {55},
number = {7},
year = {1979},
pages = { 49-52},
language = {en},
url = {http://dml.mathdoc.fr/item/1195517435}
}
Graef, John R. Limit circle type criteria for nonlinear differential equations. Proc. Japan Acad. Ser. A Math. Sci., Tome 55 (1979) no. 7, pp. 49-52. http://gdmltest.u-ga.fr/item/1195517435/