@article{ZNSL_2005_323_a13,
     author = {M. N. Yakovlev},
     title = {Existence of nonnegative solutions of singular boundary-value problems for second-order ordinary differential equations},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {215--222},
     publisher = {mathdoc},
     volume = {323},
     year = {2005},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2005_323_a13/}
}