https://link.springer.com/chapter/10.1007/3-540-45681-3_20?error=cookies_not_supported&code=f5b999c4-8fdc-48f3-8891-c1fba9874d5e

https://link.springer.com/chapter/10.1007/3-540-45681-3_20?error=cookies_not_supported&code=f5b999c4-8fdc-48f3-8891-c1fba9874d5e

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