Bachhan, RK, B Aryal, and U Khanal. “Estimation of Cosmological Constant of Nearby Spiral Galaxies Using Rotation Curve”. Scientific World 8, no. 8 (October 15, 2010): 15–18. Accessed May 17, 2024. https://www.nepjol.info/index.php/SW/article/view/3840.