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Dynamic equations on time scales: a survey
(Elsevier BV, 2002-04-01)
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 ...
Solvability of singular second order m-point boundary value problems
(Elsevier BV, 2005-01-01)