|   |  PUBLICATIONS DE L'INSTITUT MATHÉMATIQUE (BEOGRAD) (N.S.) Vol. 34(48), pp. 121--124 (1983) | 
|  | ON $\Sigma_1^0$-EXTENSIONS OF $\omega$Zarko Mijajlovi\'cMatematicki fakultet, Beograd, YugoslaviaClassification (MSC2000): 03 H15, 03H20 Full text of the article: 
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