Kurniawan, Isman, Wardhani, Reina, Rosalinda, Maya, AND Ikhsan, Nurul. " QSAR Study for Prediction of HIV-1 Protease Inhibitor Using the Gravitational Search Algorithm–Neural Network (GSA-NN) Methods" Lontar Komputer : Jurnal Ilmiah Teknologi Informasi [Online], Volume 12 Number 2 (12 July 2021)