Variability of X-ray pulsars in a hard energy band observed with   INTEGRAL
  We present the first results of the observations of the X-ray pulsars LMC X-4, 4U0352+309 and EXO1722-363 performed with the INTEGRAL observatory. The LMC X-4 was investigated during the whole superorbital cycle ($\sim$30 days) and it was found that its period was not stable at this time scale. We detected a variable X-ray flux (18-60 keV) from the pulsar EXO1722-363, which could be connected with the orbital motion in the binary system. A more accurate position and the estimate of the orbital period for this source are reported. We also investigated a hard X-ray spectrum of 4U0352+309 (X Persei) measured with INTEGRAL and report the detection of the cyclotron absorption line at about 29 keV. 
A.Lutovinov (1), S.Tsygankov (1), M.Revnivtsev (1,2), M.Chernyakova   (3), I.Bikmaev (4,5), S.Molkov (1), R.Burenin (1), N.S...