A Project of Speech Input and Output in an E-commerce Application. - Diamantino Freitas; António Moura; Daniela Braga; Hélder Ferreira; João Paulo Ramos Teixeira; Maria João Barros; Paulo Gouveia; Vagner Latsch (PorTAL, 2002)

On the application of W3C Guidelines in Website Design from scratch. - Diamantino Freitas; Hélder Ferreira (HCI (4), 2003)

Enhancing the Accessibility of Mathematics for Blind People: The AudioMath Project. - Hélder Ferreira; Diamantino Freitas (ICCHP, 2004)

Audio Rendering of Mathematical Formulae Using MathML and AudioMath. - Hélder Ferreira; Diamantino Freitas (User Interfaces for All, 2004)

INPERLYS - Independent Personal Location System. - Hélder Ferreira; Lino Figueiredo; António Meireles (AMIF, 2009)

Continuous Zoom Calibration by Tracking Salient Points in Endoscopic Video. - Miguel Lourenço; João Pedro Barreto 001; Fernando Fonseca; Hélder Ferreira; Rui M. Duarte; Jorge Correia-Pinto (MICCAI (1), 2014)

Antecedents and outcomes of middle managers' adoption of gamification as a strategic alignment tool. - Hélder Ferreira; Catarina Roseira (GamiFIN, 2018)

Antecedents of the Adoption of Gamification in Strategy Alignment: An Exploratory Study of Middle Managers' Perspective. - Hélder Ferreira; Catarina Roseira (GALA, 2020)

7 P's of Gamification: A Strategic Design Tool for Ideation of Gamified Solutions. - Hélder Ferreira; Catarina Roseira; Rui Patrício (GALA, 2020)