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@article{AMLG_1975__17_137904, author = {N. Georgieva}, title = {On the decidability of p', p'' and p''*.}, journal = {Archiv f\"ur mathematische Logik und Grundlagenforschung}, pages = {51--54}, publisher = {mathdoc}, volume = {17}, year = {1975}, zbl = {0361.02058}, url = {http://geodesic.mathdoc.fr/item/AMLG_1975__17_137904/} }
N. Georgieva. On the decidability of p', p'' and p''*.. Archiv für mathematische Logik und Grundlagenforschung, Tome 17 (1975), pp. 51-54. http://geodesic.mathdoc.fr/item/AMLG_1975__17_137904/