Rokityansky, I., V. I. Tregubenko, V. Babak, and A. V. Tereshin. ‚ÄúVariation of the Components of the Induction Vector and the Horizontal Tensor before the Tohoku Earthquake March 11, 2011 According to the Data of Japanese Geomagnetic Observatories‚ÄĚ. Geofizicheskiy Zhurnal, vol. 35, no. 3, Apr. 2013, pp. 115-30, doi:10.24028/gzh.0203-3100.v35i3.2013.116406.