Hodianto, V. A., and Y. I-Tung. “MULTI-MODE RESOURCE CONSTRAINED MULTI PROJECT SCHEDULING PROBLEM OPTIMIZATION WITH SYMBIOTIC ORGANISMS SEARCH”. Dimensi Utama Teknik Sipil, vol. 9, no. 1, Apr. 2022, pp. 77-96, doi:10.9744/duts.9.1.77-96.