Lakhveer Kaur และ Rajesh Kumar Gupta. (2013) Symmetries and exact solutions of Einstein field equations for perfect fluid distribution and pure radiation fields. <i>Maejo International Journal of Science and Technology</i>, <i>7</i>(1), 133.Lakhveer Kaur และ Rajesh Kumar Gupta. "Symmetries and exact solutions of Einstein field equations for perfect fluid distribution and pure radiation fields". Maejo International Journal of Science and Technology 7 (2013):133.Lakhveer Kaur และ Rajesh Kumar Gupta. Symmetries and exact solutions of Einstein field equations for perfect fluid distribution and pure radiation fields. Maejo University:ม.ป.ท. 2013.