YACOB, A., and N. S. SASTRI. “Morphology of Great Geomagnetic Storms Recorded at Alibag During 1905-1945 : Part 1- The Storm- Time Disturbance Variation Dst”. MAUSAM, vol. 16, no. 1, Jan. 1965, pp. 33-42, doi:10.54302/mausam.v16i1.5611.