@article{10_4064_fm_44_1_61_71,
     author = {Andrzej Grzegorczyk},
     title = {On the definitions of computable real continuous functions},
     journal = {Fundamenta Mathematicae},
     pages = {61--71},
     publisher = {mathdoc},
     volume = {44},
     number = {1},
     year = {1957},
     doi = {10.4064/fm-44-1-61-71},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-44-1-61-71/}
}