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- [44] PHOTOMETRIC DATA FOR OLD GALACTIC CLUSTER NGC 188 ASTROPHYSICAL JOURNAL, 1962, 135 (02): : 333 - &
- [45] INVESTIGATION OF GALACTIC CLUSTER M 34 (NGC 1039) ASTRONOMICHESKII ZHURNAL, 1974, 51 (06): : 1248 - 1250
- [46] PHOTOELECTRIC OBSERVATIONS OF THE GALACTIC CLUSTER NGC-6940 ASTROPHYSICAL JOURNAL, 1958, 128 (03): : 562 - &
- [50] PHOTOMETRIC INVESTIGATION OF GALACTIC CLUSTER NGC2281 ASTRONOMICAL JOURNAL, 1964, 69 (08): : 529 - &