@book{ BB24722215,
 author = "Ballmann, Werner and Matthias, Hans-Heinrich",
 title = "Der Satz von Lusternik und Schnirelmann",
 publisher = "[s.n.]",
 year = "1978",
 series = "Bonner mathematische Schriften",
 number = "Nr. 102",
 URL = "https://ci.nii.ac.jp/ncid/BB24722215"
}
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