A Simple Wireless Sensor Node System for Electricity Monitoring Applications: Design, Integration, and Testing with Different Piezoelectric Energy Harvesters. - Zongxian Yang; Sid Zarabi; Egon Fernandes; Maria-Isabel Rua-Taborda; Hélène Debéda; Armaghan Salehian; David Nairn; Lan Wei (Sensors, 2018)