G. Upender Reddy, Addala Ajay Babu, Ch. Shashi Kumar, and T. Siva Nageswara Rao. 2021. “Bipolar Sum Distance in Neutrosophic Graphs”.
Malaya Journal of Matematik
9 (01). India:1083-85. https://www.malayajournal.org/index.php/mjm/article/view/1225.