J1(p) has connected fibers.
Conrad, Brian ; Edixhoven, Bas ; Stein, William
Documenta Mathematica, Tome 8 (2003), p. 331-408 / Harvested from The Electronic Library of Mathematics
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Publié le : 2003-01-01
EUDML-ID : urn:eudml:doc:126737 
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     title = {<title-group xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"><article-title xml:lang="en"><math><mrow><msub><mi>J</mi><mn>1</mn></msub><mrow><mo>(</mo><mi>p</mi><mo>)</mo></mrow></mrow></math> has connected fibers.</article-title></title-group>},
     journal = {Documenta Mathematica},
     volume = {8},
     year = {2003},
     pages = {331-408},
     zbl = {1101.14311},
     language = {en},
     url = {http://dml.mathdoc.fr/item/02028918}
}

Conrad, Brian; Edixhoven, Bas; Stein, William. J1(p) has connected fibers.. Documenta Mathematica, Tome 8 (2003) pp. 331-408. http://gdmltest.u-ga.fr/item/02028918/