@article{CMH_1982__57_139890,
     author = {Fritz Ehlers and Horst Kn\"orrer},
     title = {An algebro-geometric interpretation of the {B\"acklund-transformation} for the {Korteweg-de} {Vries} equation.},
     journal = {Commentarii mathematici Helvetici},
     pages = {1--10},
     publisher = {mathdoc},
     volume = {57},
     year = {1982},
     zbl = {0516.35071},
     url = {http://geodesic.mathdoc.fr/item/CMH_1982__57_139890/}
}