Matrix expansions for computing the discrete hartley transform for blocklength N ≡ 0 (mod 4). - R. C. de Oliveira; Ricardo M. Campello de Souza; Hélio M. de Oliveira (LATINCOM, 2012)

A Flexible Implementation of a Matrix Laurent Series-Based 16-Point Fast Fourier and Hartley Transforms. - R. C. de Oliveira; Hélio M. de Oliveira; Ricardo M. Campello de Souza; E. J. P. Santos (CoRR, 2015)

A Matrix Laurent Series-based Fast Fourier Transform for Blocklengths N=4 (mod 8). - Hélio M. de Oliveira; Ricardo M. Campello de Souza; R. C. de Oliveira (CoRR, 2015)

Performance Assessment of WhatsApp and IMO on Android Operating System (Lollipop and KitKat) during VoIP calls using 3G or WiFi. - R. C. de Oliveira; Hélio Magalhães de Oliveira; R. A. Ramalho; L. P. S. Viana (CoRR, 2016)

Understanding MIDI: A Painless Tutorial on Midi Format. - Hélio Magalhães de Oliveira; R. C. de Oliveira (CoRR, 2017)

Linear Computer-Music through Sequences over Galois Fields. - Hélio Magalhães de Oliveira; R. C. de Oliveira (CoRR, 2017)