@article{CM_1972__24_1_33_0,
     author = {Vesley, R. E.},
     title = {Choice sequences and {Markov's} principle},
     journal = {Compositio Mathematica},
     pages = {33--53},
     publisher = {Wolters-Noordhoff Publishing},
     volume = {24},
     number = {1},
     year = {1972},
     mrnumber = {313023},
     zbl = {0237.02005},
     language = {en},
     url = {http://www.numdam.org/item/CM_1972__24_1_33_0/}
}