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1
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2
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3Dahkki Ball, Roderick D. (Roderick Douglas)Fáttát “...Critical point theory (Mathematical analysis)...”
Almmustuhtton 1978
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4
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5Dahkki Rabinowitz, Paul H.Fáttát “...Critical point theory (Mathematical analysis) Congresses....”
Almmustuhtton 1986
Girji