@article{10_4064_fm_142_2_123_137,
     author = {G. Sherman},
     title = {Measure extension for a piecewise invariant map},
     journal = {Fundamenta Mathematicae},
     pages = {123--137},
     publisher = {mathdoc},
     volume = {142},
     number = {2},
     year = {1993},
     doi = {10.4064/fm-142-2-123-137},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-142-2-123-137/}
}