@article{10_4064_ap88_3_4,
     author = {Pham Hoang Hiep},
     title = {The comparison principle and {Dirichlet} problem
 in the class ${\cal E}_p(f)$, $p>0$},
     journal = {Annales Polonici Mathematici},
     pages = {247--261},
     publisher = {mathdoc},
     volume = {88},
     number = {3},
     year = {2006},
     doi = {10.4064/ap88-3-4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap88-3-4/}
}