Copyright © 2010 Ruyun Ma and Jiemei Li. This is an open access article distributed under the
Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
We are concerned with the existence of positive solutions of singular
second-order boundary value problem , , , which is not necessarily linearizable. Here, nonlinearity is allowed to
have singularities at . The proof of our main result is based upon topological degree theory and global bifurcation techniques.