Enhancing the communication value of UML models with graphical layers. - Yosser El Ahmar; Sebastien Gerard; Cédric Dumoulin; Xavier Le Pallec (MoDELS, 2015)

Empirical Activity: Assessing the Perceptual Properties of the Size Visual Variation in UML Sequence Diagram. - Yosser El Ahmar; Xavier Le Pallec; Sébastien Gérard (HuFaMo@MoDELS, 2016)

Visual Variables in UML: a First Empirical Assessment. - Yosser El Ahmar; Xavier Le Pallec; Sébastien Gérard; Truong Ho-Quang (MoDELS (Satellite Events), 2017)

The visual variables in UML: how are they used by women? - Yosser El Ahmar; Xavier Le Pallec; Sébastien Gérard (ECSA (Companion), 2018)

Enhancing the Cognitive Effectiveness of UML Diagrams: Application of the Semiology of Graphics. (Améliorer l'efficacité cognitive des diagrammes UML: application de la sémiologie graphique). - Yosser El Ahmar (2018)