Geodesic
Theory of $A$-spaces
Algebra i logika, Tome 12 (1973) no. 4, pp. 369-416 
Yu. L. Ershov. Theory of $A$-spaces. Algebra i logika, Tome 12 (1973) no. 4, pp. 369-416. http://geodesic.mathdoc.fr/item/AL_1973_12_4_a0/
@article{AL_1973_12_4_a0,
     author = {Yu. L. Ershov},
     title = {Theory of $A$-spaces},
     journal = {Algebra i logika},
     pages = {369--416},
     year = {1973},
     volume = {12},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1973_12_4_a0/}
}
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