Danish Siddiqi, M. “GRADIENT RICCI SOLITONS IN δ-LORENTZIAN TRANS-SASAKIAN MANIFOLDS WITH SEMI-SYMMETRIC METRIC CONNECTION”. Bangmod International Journal of Mathematical and Computational Science, vol. 4, Dec. 2018, pp. 34-58, https://bangmodjmcs.com/index.php/bangmodmcs/article/view/48.