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by Arnold, Vladimir I., Kozlov, Valery V., Neishtadt, Anatoly I.
Published 2006
“...Encyclopaedia of Mathematical Sciences...”Published 2006
Springer Berlin Heidelberg
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by Collins, D.J., Grigorchuk, R.I., Kurchanov, P.F., Zieschang, H.
Published 1993
“...Encyclopaedia of Mathematical Sciences...”Published 1993
Springer Berlin Heidelberg