no. 1
On Tunnell’s formula for characters of GL(2)
Compositio Mathematica, Tome 85 (1993) no. 1, pp. 99-108. 
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     author = {Saito, Hiroshi},
     title = {On {Tunnell{\textquoteright}s} formula for characters of $GL(2)$},
     journal = {Compositio Mathematica},
     pages = {99--108},
     publisher = {Kluwer Academic Publishers},
     volume = {85},
     number = {1},
     year = {1993},
     mrnumber = {1199206},
     zbl = {0795.22009},
     language = {en},
     url = {http://www.numdam.org/item/CM_1993__85_1_99_0/}
}
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Saito, Hiroshi. On Tunnell’s formula for characters of $GL(2)$. Compositio Mathematica, Tome 85 (1993) no. 1, pp. 99-108. http://www.numdam.org/item/CM_1993__85_1_99_0/

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