Consecutive customer losses in oscillating GI X / M // n systems with state dependent services rates. - António Pacheco 001; Helena Ribeiro (Ann. Oper. Res., 2008)

Consecutive customer losses in regular and oscillating MX/G/1/n systems. - António Pacheco 001; Helena Ribeiro (Queueing Syst. Theory Appl., 2008)

On the Blocking Probability and Loss Rates in Nonpreemptive Oscillating Queueing Systems. - Fátima Ferreira; António Pacheco 001; Helena Ribeiro (ASMTA, 2016)

Moments of losses during busy-periods of regular and nonpreemptive oscillating MX/G/1/n systems. - Fátima Ferreira; António Pacheco 001; Helena Ribeiro (Ann. Oper. Res., 2017)

Numbers of Served and Lost Customers in Busy-Periods of M/M/1/n Systems with Balking. - Fátima Ferreira; António Pacheco 001; Helena Ribeiro (ICCSA (3), 2020)

Distribution of the number of losses in busy-periods of oscillating MX/G/1/(n, a, b) systems. - Fátima Ferreira; António Pacheco 001; Helena Ribeiro (Comput. Oper. Res., 2021)

Ultralow Read Sensitivity RFID sensor based on Tunnel Diode Voltage-Controlled Oscillator. - Yero Dia; Helena Ribeiro; Laurent Oyhenart; Elie Zaraket; Jean-Luc Lachaud; Ludivine Fadel; Valerie Vigneras; Corinne Dejous; Nuno Carvalho; Simon Hemour (RFID-TA, 2023)

Enhancement of RF-DC Converters Efficiency by Input Impedance Optimization. - Helena Ribeiro; Diogo Matos; Nuno Borges Carvalho; Apostolos Georgiadis (IEEE Access, 2024)