@article{10_4064_ap91_2_2,
     author = {Per \r{A}hag and Rafa{\l}  Czy\.z and Pham Ho\`ang Hi\^ep},
     title = {Concerning the energy class $\mathcal E_p$ for $0< p< 1$},
     journal = {Annales Polonici Mathematici},
     pages = {119--130},
     publisher = {mathdoc},
     volume = {91},
     number = {2-3},
     year = {2007},
     doi = {10.4064/ap91-2-2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap91-2-2/}
}