Deep Bhattacharjee, Sanjeevan Singha Roy and Riddhima Sadhu (2022) “HOMOTOPY GROUP OF SPHERES, HOPF FIBRATIONS AND VILLARCEAU CIRCLES”, EPRA International Journal of Research and Development (IJRD), 7(9), pp. 57–64. Available at: http://www.eprajournals.net/index.php/IJRD/article/view/892 (Accessed: 19 May 2024).