Mathematical Inequalities & Applications · Volume 11, Issue 1 An approximation approach to eigenvalue intervals for singular boundary value problems with sign changing nonlinearities 11-05 Pages 81-98 DOI 10.7153/mia-11-05 Downloads Short PDF Full PDF PNG Authors Haishen Lü Donal O'Regan Ravi P. Agarwal Keywords singular boundary value problems positive solution upper and lower solution Subject classes 34B15