@article{IM_1973__21_142227,
     author = {Christian Berg},
     title = {Non-Symmetric {Translation} {Invariant} {Dirichlet} {Forms.}},
     journal = {Inventiones mathematicae},
     pages = {199--212},
     publisher = {mathdoc},
     volume = {21},
     year = {1973},
     zbl = {0263.31010},
     url = {http://geodesic.mathdoc.fr/item/IM_1973__21_142227/}
}