N. PURWANTI, “KAPASITAS ADSORPSI BENTONIT TEKNIS SEBAGAI ADSORBEN LOGAM BERATCu(II) DENGAN PESAING ION Ca2+CAPACITY OF ADSORPTION A TECHNICAL BENTONITE AS AN ADSORBENT OFHEAVY METAL Cu(II) WITH IONS Ca2+ COMPETITORS”, UJC, vol. 3, no. 3, Oct. 2014.