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Über Worte ..... ... in einer freien Gruppe mit p freien Erzeugenden.

H. ZIESCHANG — 1962

Mathematische Annalen

Über Automorphismen ebener diskontinuierlicher Gruppen.

H. ZIESCHANG — 1966

Mathematische Annalen

Über die Nielsensche Kürzungsmethode in freien Produkten mit Amalgan

H. ZIESCHANG — 1970

Inventiones mathematicae

Über die schwache Konvergenz der Haarschen Maße von Untergruppen.

J. Flachsmeyer; H. ZIESCHANG — 1964

Mathematische Annalen

Eine Kennzeichnung der Torusknoten

G. Burde; H. ZIESCHANG — 1966

Mathematische Annalen

Primitives in the Free Group on Two Generators.

R.P. Osborne; H. Zieschang — 1981

Inventiones mathematicae

Hegaard genus of closed orientable Seifert 3-manifolds.

M. Boileau; H. Zieschang — 1984

Inventiones mathematicae

Genus 2 Heegaard decompositions of small Seifert manifolds

Michel Boileau; D. J. Collins; H. Zieschang — 1991

Annales de l'institut Fourier

The genus 2 Heegaard splittings and decompositions of Seifert manifolds over $S$ with 3 exeptional fibres are classified with respect to isotopies and homeomorphisms. In general there are 3 different isotopy classes of Heegaard splittings and 6 different isotopy classes of Heegaard decompositions. Moreover, we determine when a homeomorphism class is not an isotopy class.

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