@article{10_4064_sm162_2_4,
     author = {Chuan Jen Chyan and Andrzej Fryszkowski},
     title = {Vitali {Lemma} approach to differentiation 
 on a time scale},
     journal = {Studia Mathematica},
     pages = {161--173},
     publisher = {mathdoc},
     volume = {162},
     number = {2},
     year = {2004},
     doi = {10.4064/sm162-2-4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm162-2-4/}
}