Premadi, P. W., D. H. Nugroho, and A. T. Jaelani. “Properties of the Environment of Galaxies in Clusters of Galaxies CL 0024+1654 and RX J0152.7−1357”. Journal of Mathematical and Fundamental Sciences, vol. 53, no. 3, Dec. 2021, pp. 428-50, doi:10.5614/j.math.fund.sci.2021.53.3.7.