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- [49] RELATIONSHIP BETWEEN OPTICAL AND X-RAY-PROPERTIES OF O-TYPE STARS SURVEYED WITH THE EINSTEIN-OBSERVATORY ASTROPHYSICAL JOURNAL, 1990, 361 (02): : 621 - 643
- [50] X-RAY-EMISSION AT THE LOW-MASS END - RESULTS FROM AN EXTENSIVE EINSTEIN-OBSERVATORY SURVEY ASTROPHYSICAL JOURNAL, 1993, 414 (02): : 846 - 866