TY JOUR TI Detection of hardware failures at INTERMAGNET observatories: application of artificial intelligence techniques to geomagnetic records study KW time series KW pattern recognition KW geomagnetic observations JO Russian Journal of Earth Sciences AU Soloviev, A.A. AU Bogoutdinov, S.R. AU Agayan, S.M. AU Gvishiani, A.D. AU Kihn, E.. PY 2009 IS 11 PB Geophysical Center of the Russian Academy of Sciences