Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Hayashi Toshiaki and Kitagawa Yoshiyuki,Improvement of Durability of Electret Filter for Tobacco Smoke,"Journal of the Society of Powder Technology, Japan",03866157,"The Society of Powder Technology, Japan",2017,54,6,406-409,https://cir.nii.ac.jp/crid/1390282679489495040,https://doi.org/10.4164/sptj.54.406