Widowati, W., D. K. Jasaputra, P. Onggowidjaja, S. B. Sumitro, M. A. Widodo, E. Afifah, D. D. Rihibiha, R. Rizal, A. Amalia, H. S. W. Kusuma, H. Murti, and I. Bachtiar. “Effects of Conditioned Medium of Co-Culture IL-2 Induced NK Cells and Human Wharton’s Jelly Mesenchymal Stem Cells (hWJMSCs) on Apoptotic Gene Expression in a Breast Cancer Cell Line (MCF-7)”. Journal of Mathematical and Fundamental Sciences, vol. 51, no. 3, Dec. 2019, pp. 205-24, doi:10.5614/j.math.fund.sci.2019.51.3.1.