1. F Jianqing, Z Yonglio, B Wei, Z Yongchun, L Chin J. Geochem.29 204 (2010)
2. D Kumar Sarma, M Konwar, S Sharma Indian J. Radio Space Phys.35 (2006) 259 (2006)
3. Y Soldo, D M Le Vine, P de Matthaeis, P Richaume IEEE Trans. Geosci. Remote Sens.55 7 (2017)
4. P N Mohammed, M Aksoy, J R Piepmeier, J T Johnson, A Bringer IEEE Trans. Geosci. Remote Sens. 54 10 (2016)
5. D M Le Vine, P De Matthaeis IEEE Geosci. Remote Sens. Lett. 11 10 (2014).