no. 2
The restriction to SL 2 of a supercuspidal representation of GL 2
Compositio Mathematica, Tome 79 (1991) no. 2, pp. 139-155. 
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     author = {Kutzko, P. and Pantoja, J.},
     title = {The restriction to $\mathrm {SL}_2$ of a supercuspidal representation of $\mathrm {GL}_ 2$},
     journal = {Compositio Mathematica},
     pages = {139--155},
     publisher = {Kluwer Academic Publishers},
     volume = {79},
     number = {2},
     year = {1991},
     mrnumber = {1117337},
     zbl = {0733.22011},
     language = {en},
     url = {http://www.numdam.org/item/CM_1991__79_2_139_0/}
}
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Kutzko, P.; Pantoja, J. The restriction to $\mathrm {SL}_2$ of a supercuspidal representation of $\mathrm {GL}_ 2$. Compositio Mathematica, Tome 79 (1991) no. 2, pp. 139-155. http://www.numdam.org/item/CM_1991__79_2_139_0/

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