@article{JRAM_1989__394_153099,
     author = {A. Tesei and P. de Mottoni and L. A. Peletier},
     title = {Free boundary eigenfunctions for a nonlinear degenerate eigenvalue problem.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {31--58},
     publisher = {mathdoc},
     volume = {394},
     year = {1989},
     zbl = {0655.35064},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1989__394_153099/}
}