no. 2
On singular and supersingular invariants of Drinfeld modules
Annales de la Faculté des sciences de Toulouse : Mathématiques, Série 6, Tome 6 (1997) no. 2, pp. 319-334. 
@article{AFST_1997_6_6_2_319_0,
     author = {Schweizer, Andreas},
     title = {On singular and supersingular invariants of {Drinfeld} modules},
     journal = {Annales de la Facult\'e des sciences de Toulouse : Math\'ematiques},
     pages = {319--334},
     publisher = {Universit\'e Paul Sabatier. Facult\'e des sciences},
     address = {Toulouse},
     volume = {Ser. 6, 6},
     number = {2},
     year = {1997},
     mrnumber = {1611844},
     zbl = {0906.11029},
     language = {en},
     url = {http://www.numdam.org/item/AFST_1997_6_6_2_319_0/}
}
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Schweizer, Andreas. On singular and supersingular invariants of Drinfeld modules. Annales de la Faculté des sciences de Toulouse : Mathématiques, Série 6, Tome 6 (1997) no. 2, pp. 319-334. http://www.numdam.org/item/AFST_1997_6_6_2_319_0/

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