@article{ASNSP_1999_4_28_3_413_0,
     author = {Hansen, Wolfhard},
     title = {Harnack inequalities for {Schr\"odinger} operators},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {413--470},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 28},
     number = {3},
     year = {1999},
     mrnumber = {1736524},
     zbl = {0940.35063},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1999_4_28_3_413_0/}
}