no. 1
Ergodic Z 2 -extensions over rational pure point spectrum, category and homomorphisms
Compositio Mathematica, Tome 63 (1987) no. 1, pp. 63-81. 
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     volume = {63},
     number = {1},
     year = {1987},
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     zbl = {0629.28013},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1987__63_1_63_0/}
}
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Lemańczyk, M. Ergodic $Z_2$-extensions over rational pure point spectrum, category and homomorphisms. Compositio Mathematica, Tome 63 (1987) no. 1, pp. 63-81. http://archive.numdam.org/item/CM_1987__63_1_63_0/

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