YACOB, A. and SASTRI, N. S. (1965) “Morphology of great Geomagnetic Storms recorded at Alibag during 1905-1945 : Part 1- The Storm- Time Disturbance Variation Dst”, MAUSAM, 16(1), pp. 33–42. doi: 10.54302/mausam.v16i1.5611.