A method for lossless compression of images. - Zlatoliliya Ilcheva; Valeri Ilchev (CompSysTech, 2003)

A classification method based on two separating hyper surfaces. - Valeri Ilchev; Svetozar Ilchev (CompSysTech, 2011)

Modular data hiding for improved web-portal security. - Svetozar Ilchev; Valeri Ilchev (CompSysTech, 2012)

Simplified information neural cell model and its basic properties. - Valeri Ilchev; Svetozar Ilchev (IEEE Conf. on Intelligent Systems, 2016)