@phdthesis{BJHTUP11_1991__0293__P0_0,
     author = {Kerdelhu\'e, Philippe},
     title = {\'Equation de {Schr\"odinger} magn\'etique p\'eriodique avec sym\'etries triangulaires et hexagonales : structure hi\'erarchique du spectre},
     series = {Th\`eses d'Orsay},
     publisher = {Universit\'e de Paris-Sud Centre d'Orsay},
     number = {293},
     year = {1991},
     language = {fr},
     url = {http://archive.numdam.org/item/BJHTUP11_1991__0293__P0_0/}
}