@article{articlec0d3c747,
title   = {Variable o viii warm absorber in mcg -6-30-15},
author = {Otani, C and Kii, T and Reynolds, C S and Fabian, A C and Iwasawa, W and Hayashida, K and Inoue, H and Kunieda, Hironobu and Makino, F and Matsuoka, Masao and Tanaka, Y},
year = {1996},
journal   = {Publications of the Astronomical Society of Japan}
}