Gutarowska, B., B. Brycki, K. Majchrzycka, and A. Brochocka. 2010. “New Bioactive Polymer Filtering Material Composed of Nonwoven Polypropylene Containing Alkylammonium Microbiocides on a Perlite Carrier”. Polimery 55 (7-8):568-74. http://ichp.vot.pl/index.php/p/article/view/1042.