Bóta, Attila, Krisztina Laszlo, Lajos Gyorgy Nagy, Guenter Subklew, Heide Schlimper, and Milan J. Schwuger. (1996) 1996. “Adsorbents From Waste Materials”. Adsorption 3: 81-91. http://www.scopus.com/inward/record.url?eid=2-s2.0-0030364980&partnerID=40&md5=ef4d59f31f9e9bf0c09c9e5ea61baf2b.