SPECTRAL PROPERTIES OF HARD X-RAY-EMISSION (10-100 KEV) FROM THE PERIODIC SOURCES CEN X-4, 4U1755-33, 4U1700-37, MXB1659-29, AND 4U1822-37 - RESULTS OF PROGNOZ-9 OBSERVATIONS
Mi. Kudryavtsev et al., SPECTRAL PROPERTIES OF HARD X-RAY-EMISSION (10-100 KEV) FROM THE PERIODIC SOURCES CEN X-4, 4U1755-33, 4U1700-37, MXB1659-29, AND 4U1822-37 - RESULTS OF PROGNOZ-9 OBSERVATIONS, Astronomy letters, 21(2), 1995, pp. 224-229