@article{JEMS_2018_20_8_a0,
     author = {Tuomas Hyt\"onen and Andreas Ros\'en},
     title = {Bounded variation approximation of $L_p$ dyadic martingales and solutions to elliptic equations},
     journal = {Journal of the European Mathematical Society},
     pages = {1819--1850},
     publisher = {mathdoc},
     volume = {20},
     number = {8},
     year = {2018},
     doi = {10.4171/jems/800},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/jems/800/}
}