@article{10_4064_fm193_2_2,
     author = {Piotr Szuca},
     title = {The {Covering} {Principle} for {Darboux} {Baire} 1 functions},
     journal = {Fundamenta Mathematicae},
     pages = {133--140},
     publisher = {mathdoc},
     volume = {193},
     number = {2},
     year = {2007},
     doi = {10.4064/fm193-2-2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm193-2-2/}
}