@article{AM_2000_152_2_a6,
     author = {Peter Li and Jiaping Wang},
     title = {Counting dimensions of $L$-harmonic functions},
     journal = {Annals of mathematics},
     publisher = {mathdoc},
     volume = {152},
     number = {2},
     year = {2000},
     url = {http://geodesic.mathdoc.fr/item/AM_2000_152_2_a6/}
}