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      Agarwal, Ravi P.; O'Regan, Donal (American Mathematical Society (AMS), 2000-07-01)
      In this paper we establish the existence of two nonnegative solutions to singular (n, p) and singular (p, n - p) focal boundary value problems. Our nonlinearity f(t, y) may be singular at y = 0, t = 0 and/or t = 1.
    • Multiple solutions for higher-order difference equations 

      Agarwal, R.P.; O'Regan, D. (Elsevier BV, 1999-05-01)