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Probleme der Leitung und Planung der sozialistischen Wirtschaft ,
2
Zur Wechselwirkung objektiver und subjektiver Faktoren bei ..:
, In:
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Nonlinear equations with small parameter
volume 2 ,
3
Waves and boundary problems
, In:volume 2
De Gruyter series in nonlinear analysis and applications ; volume 23/2
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4
Nonlinear equations with small parameter
Volume 2: waves and boundary problems
De Gruyter Series in Nonlinear Analysis and Applications ; Volume 23/2
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Nonlinear equations with small parameter
volume 1 ,
5
Oscillations and Resonances
, In:volume 1
De Gruyter Series in Nonlinear Analysis and Applications ; 23/1;De Gruyter series in nonlinear analysis and applications ; volume 23/1