@article{IM2_2006_70_4_a2,
     author = {A. A. Dovgoshey and O. Martio},
     title = {Mutually singular functions and computation of the lengths of curves},
     journal = {Izvestiya. Mathematics },
     pages = {693--716},
     publisher = {mathdoc},
     volume = {70},
     number = {4},
     year = {2006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2006_70_4_a2/}
}