  In this paper we define a new concept of quasi-convolution for analytic
functions normalized by $f(0)=0$ and $f^\prime(0)=1$ in the unit disk $E=\{z\in
\mathbb{C}\colon |z|<1\}$. We apply this new approach to study the closure
properties of a certain class of analytic and univalent functions under some
families of (known and new) integral operators.
