Katsumi Hattori Masaru Yamaguchi Naofumi Iwama Masashi Hayakawa GCV-Aided Linear Image Regularization for the Reconstruction of Wave Distribution Function of Magnetospheric VLF/ELF Waves. 788-792 1993 conf/caip/1993 CAIP db/conf/caip/caip1993.html#HattoriYIH93