https://link.springer.com/chapter/10.1007/3-540-45357-1_49?error=cookies_not_supported&code=c518e912-f183-4752-9a24-a753af3411e1

https://link.springer.com/chapter/10.1007/3-540-45357-1_49?error=cookies_not_supported&code=c518e912-f183-4752-9a24-a753af3411e1

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