An objective method for quality assessment of ultra-wideband speech corrupted by echo. - Luiz W. P. Biscainho; Paulo A. A. Esquef; Fabio P. Freeland; Leonardo O. Nunes; Alan Freihof Tygel; Bowon Lee; Amir Said; Ton Kalker; Ronald W. Schafer (MMSP, 2009)

The Development of an Information System for the Solidarity Economy Movement. - Alan Freihof Tygel; Celso Alexandre Souza de Alvear (J. Community Informatics, 2011)

A Parametric Objective Quality Assessment Tool for Speech Signals Degraded by Acoustic Echo. - Leonardo O. Nunes; Flávio R. Avila; Alan Freihof Tygel; Luiz W. P. Biscainho; Bowon Lee; Amir Said; Ronald W. Schafer (IEEE Trans. Speech Audio Process., 2012)

Teaching Open Data for Social Movements: a Research Strategy. - Alan Freihof Tygel; Maria Luiza Machado Campos; Celso Alexandre Souza de Alvear (J. Community Informatics, 2015)

"How Much?" is not Enough: an Analysis of Open Budget Initiatives. - Alan Freihof Tygel; Judie Attard; Fabrizio Orlandi; Maria Luiza Machado Campos; Sören Auer (ICEGOV, 2016)

Towards Cleaning-Up Open Data Portals: A Metadata Reconciliation Approach. - Alan Tygel; Sören Auer; Jeremy Debattista; Fabrizio Orlandi; Maria Luiza Machado Campos (ICSC, 2016)

Data Literacy - What is it and how can we make it happen? - Mark Frank; Johanna Walker; Judie Attard; Alan Tygel (J. Community Informatics, 2016)

Contributions of Paulo Freire for a Critical Data Literacy: a Popular Education Approach. - Alan Freihof Tygel; Rosana Kirsch (J. Community Informatics, 2016)