https://link.springer.com/chapter/10.1007/3-540-45681-3_20?error=cookies_not_supported&code=72a9b554-09dd-47e0-b4e2-35a8e8dde36c

https://link.springer.com/chapter/10.1007/3-540-45681-3_20?error=cookies_not_supported&code=72a9b554-09dd-47e0-b4e2-35a8e8dde36c

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