@article{10_4064_fm210_2_1,
     author = {Denny H. Leung and Wee-Kee Tang and Atok Zulijanto},
     title = {A gauge approach to an ordinal index of {Baire} one functions},
     journal = {Fundamenta Mathematicae},
     pages = {99--109},
     publisher = {mathdoc},
     volume = {210},
     number = {2},
     year = {2010},
     doi = {10.4064/fm210-2-1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm210-2-1/}
}