Affiliation: | 1. PetroVietNam Gas Joint Stock Corporation, 673 Nguyen Huu Tho Street, Nha Be District, Ho Chi Minh City, Viet Nam;2. Petroleum Faculty, PetroVietNam Manpower Training College, No 43, Road 30/4, Ward 9, Vung Tau City, Viet Nam;1. Physics Department and Biruni Observatory, College of Sciences, Shiraz University, Shiraz 71454, Iran;2. Research Institute for Astronomy and Astrophysics of Maragha (RIAAM), P.O. Box 55134-441, Maragha, Iran;3. Department of Physics, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India |