@article{CM_1982__46_3_307_0,
     author = {Kramer, K. and Tunnell, J.},
     title = {Elliptic curves and local $\epsilon $-factors},
     journal = {Compositio Mathematica},
     pages = {307--352},
     publisher = {Martinus Nijhoff Publishers},
     volume = {46},
     number = {3},
     year = {1982},
     zbl = {0496.14030},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1982__46_3_307_0/}
}