Ruben Cornelius Siagian, Lulut Alfaris, and Goldberd Harmuda Duva Sinaga. 2023. “Review for Understanding Dark Matter in The Universe As Negative Energy”. Proceeding International Conference on Religion, Science and Education 2 (April):679-85. http://sunankalijaga.org/prosiding/index.php/icrse/article/view/980.