https://link.springer.com/chapter/10.1007/3-540-45681-3_20?error=cookies_not_supported&code=6004f8f8-e22a-4f31-ab26-b67f3b73c49d

https://link.springer.com/chapter/10.1007/3-540-45681-3_20?error=cookies_not_supported&code=6004f8f8-e22a-4f31-ab26-b67f3b73c49d

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