Arnaud, K.A., Branduardi-Raymont, G., Culhane, J.L., Fabian, A.C., Hazard, C., McGlynn, T.A., Shafer, R.A., Tennant, A.F., Ward, ,, J., M., "EXOSAT observations of a strong soft X-ray excess in MKN 841", Monthly Notices of the Royal Astronomical Society, 1985