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Existence theory for single and multiple solutions to singular positone boundary value problems
(Elsevier BV, 2001-09-01)
Some new results for singular problems with sign changing nonlinearities
(Elsevier BV, 2000-01-01)
On constant-sign periodic solutions in modelling the spread of interdependent epidemics
(Cambridge University Press (CUP), 2006-01-01)
We consider the following model that describes the spread of n types of epidemics which are interdependent on each other:
u(i)(t) = integral(t)(t-r) g(i)(t, s) f(i) (s, u(1)(s), u(2)(s),..., u(n)(s))ds, t is an element of ...