Kusumawinahyu, Wuryansari Muharini, and Andonowati Andonowati. 2013. “Tinggi Maksimum Selubung Paket Gelombang Bikromatik”. Journal of Mathematical and Fundamental Sciences 35 (1):51-63. https://doi.org/10.5614/itbj.sci.2003.35.1.4.