Novan, A. 2017. KAJIAN DAYA SERAP AIR (SWELLING) PUPUK UREA SLOW RELEASE FERTILIZER (SRF) MENGGUNAKAN MATRIKS KITOSAN-ZEOLIT. Unesa Journal of Chemistry. 6, 2 (Jul. 2017). DOI:https://doi.org/10.26740/ujc.v6n2.p%p.