David R. Wiggins, Hyunjun Kim, Yonghun Cheon, Joel T. Johnson. Sub-surface object sensing with multi-frequency microwave radiometry. In IEEE International Geoscience and Remote Sensing Symposium, IGARSS 2002, Toronto, Ontario, Canada, 24-28 June 2002. pages 331-333, IEEE, 2002. [doi]
Abstract is missing.