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- [4] THIRD UHURU CATALOG OF X-RAY SOURCES [J]. ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 1974, 27 : 37 - 64
- [5] HILL R, TO BE PUBLISHED
- [6] SOFT-X-RAY SURVEY FROM GALACTIC CENTER TO VELA [J]. ASTROPHYSICAL JOURNAL, 1972, 171 (03) : 519 - +