Hermawan, E. “An Application of Radio Acoustic Sounding System (RASS) With Equatorial Atmosphere Radar (EAR) for Continuous Measurement of Atmospheric Virtual Temperature over Kototabang, West Sumatera”. Indonesian Journal of Physics, Vol. 14, no. 3, Nov. 2016, pp. 109-13, https://ijphysics.fi.itb.ac.id/index.php/ijp/article/view/88.