Kripal, Ram, Lal Chandra Shukla, and Upendra Mani Tripathi. 2021. “Zero Field Splitting Parameter of Mn2+ Doped Guanidine Zinc Sulphate Crystal -a Theoretical Study”. Boson Journal of Modern Physics 8 (1), 18-23. http://scitecresearch.com/journals/index.php/bjmp/article/view/2032.