Atulkar, R., P. A. Khan, A. A. Mansoori, and P. K. Purohit. “Mid Latitude Sporadic E-Layer Variability During Ascending Phase of Solar Cycle 24”. Journal of Scientific Research, vol. 9, no. 1, Jan. 2017, pp. 27-41, doi:10.3329/jsr.v1i1.28749.