... “Extremal solutions for nonresonance impulsive functional dynamicequations on time scales,” Applied Mathematics and Computation, vol. 196, no. 1, pp. 333–339, 2008.25 J. Henderson, “Double solutions ... Leggett-Williams fixed point theorem, the existence of three positive solutions to aclass of nonlinear first-order periodic b oundary value problems of impulsive dynamic equations on time scales with parameter ... second-order impulsive boundary value problems on time scales,” Nonlinear Analysis: Theory, Methods & Applications, vol. 70, no. 4, pp. 1648–1655, 2009.27 D B. Wang, “Positive solutions for...