Spectral changes during dipping in low-mass X-ray binaries due to highly-ionized absorbersM. Díaz Trigo, A. N. Parmar, L. Boirin, M. Méndez and J. S. KaastraA&A, 445 1 (2006) 179-195DOI: https://doi.org/10.1051/0004-6361:20053586