no. 13
The theory of boolean algebras with a distinguished subalgebra is undecidable
Annales scientifiques de l'Université de Clermont. Mathématiques, Tome 60 (1976) no. 13, pp. 129-134. 
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     title = {The theory of boolean algebras with a distinguished subalgebra is undecidable},
     journal = {Annales scientifiques de l'Universit\'e de Clermont. Math\'ematiques},
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     publisher = {UER de Sciences exactes et naturelles de l'Universit\'e de Clermont},
     volume = {60},
     number = {13},
     year = {1976},
     mrnumber = {465835},
     zbl = {0354.02036},
     language = {en},
     url = {http://archive.numdam.org/item/ASCFM_1976__60_13_129_0/}
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Rubin, Matatyahu. The theory of boolean algebras with a distinguished subalgebra is undecidable. Annales scientifiques de l'Université de Clermont. Mathématiques, Tome 60 (1976) no. 13, pp. 129-134. http://archive.numdam.org/item/ASCFM_1976__60_13_129_0/

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