@incollection{JEDP_1989____A11_0,
     author = {Jensen, Arne},
     title = {Stark hamiltonians with periodic potentials},
     booktitle = {},
     series = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     eid = {11},
     pages = {1--6},
     year = {1989},
     publisher = {Ecole polytechnique},
     doi = {10.5802/jedp.372},
     mrnumber = {1030826},
     language = {en},
     url = {https://www.numdam.org/articles/10.5802/jedp.372/}
}