G. Upender Reddy, T. Siva Nageswara Rao, N. Srinivasa Rao, and V. Venkateswara Rao. “Bipolar Topological Pre-Closed Neutrosophic Sets”. Malaya Journal of Matematik 9, no. 01 (January 1, 2021): 159–162. Accessed November 24, 2024. https://www.malayajournal.org/index.php/mjm/article/view/994.