TY - BOOK AU - Liaqat, Asia AU - Supervisor: Prof. Ibrar Hussain TI - Second-Order Approximate Lie Symmetry Methods to Define Energy Content of Some Spacetimes U1 - 200 PY - 2024/// CY - Islamabad PB - SNS NUST KW - PhD-Mathematics UR - http://10.250.8.41:8080/xmlui/handle/123456789/44595 ER -