The study of initial value problems of nonlinear quadratic
functional differential and integral equations is initiated in
the works of Dhage [1] and Dhage and O’Regan [2]. The the-
ory of quadratic integral equations is also intensively studied
and finds numerous applications in describing real world prob-
lems (see [3–21] for instance). Many authors studied the exis-
tence of solutions for several classes of nonlinear quadratic
integral equations with nonsingular kernels (see e.g. [4–8]
and the references therein). The quadratic integral equation
can be very often encountered in many applications (see [11–16]
and the references therein).