Optimation Of Time And Catalyst/Feed Ratio In Catalytic Cracking Of Waste Plastics Fraction To Gasoline Fraction Using Cr/Natural Zeolite Catalyst = Optimasi Waktu dan Rasio Katalis/Umpan pada Proses Perengkahan.. - Perpustakaan UGM, i-lib ([Yogyakarta] : Universitas Gadjah Mada, 2002)