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Time scale boundary value problems on infinite intervals
(Elsevier BV, 2002-04-01)
Some new results for singular problems with sign changing nonlinearities
(Elsevier BV, 2000-01-01)
Existence criteria for singular initial value problems with sign changing nonlinearities
(Hindawi Limited, 2001-01-01)
A general existence theory is presented for initial value problems where our nonlinearity may be singular in its dependent variable and may also change sign.