Asanavijit, Visut, and Panich Intra. 2022. “An Automated Filter Tester Based on an Electrostatic Particle Counter for Testing the Particle Filtration Efficiency of Surgical Masks and N95 Masks”. Engineering and Technology Horizons 39 (3):147-66. https://ph01.tci-thaijo.org/index.php/lej/article/view/247363.