Positive solutions for a concave semipositone Dirichlet problem. Castro, A. & Shivaji, R. Nonlinear Anal., 31(1):91--98, Pergamon, 1998.
bibtex   
@article{Castro1998,
	Author = {Castro, A. and Shivaji, R.},
	Fjournal = {Nonlinear Analysis: Theory, Methods \& Applications},
	Journal = {Nonlinear Anal.},
	Number = {1},
	Pages = {91--98},
	Publisher = {Pergamon},
	Title = {Positive solutions for a concave semipositone {D}irichlet problem},
	Volume = {31},
	Year = {1998}}
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