Sidiq, Hidayatullah, and Idra Pusvito. 2017. “Penentuan Pit Limit Penambangan Batubara Dengan Metode Lerchs-Grossmann Menggunakan 3DMine Software”. KURVATEK 1 (2), 67-72. https://doi.org/10.33579/krvtk.v1i2.245.