@article{AMLG_1983__23_138016,
     author = {A. Scedrov and R. Vesley},
     title = {On a weakening of {Markov's} principle.},
     journal = {Archiv f\"ur mathematische Logik und Grundlagenforschung},
     pages = {153--160},
     publisher = {mathdoc},
     volume = {23},
     year = {1983},
     zbl = {0533.03033},
     url = {http://geodesic.mathdoc.fr/item/AMLG_1983__23_138016/}
}