https://link.springer.com/chapter/10.1007/3-540-45681-3_20?error=cookies_not_supported&code=b5f1e9c0-5b40-485e-a97a-8ba9bddc3587

https://link.springer.com/chapter/10.1007/3-540-45681-3_20?error=cookies_not_supported&code=b5f1e9c0-5b40-485e-a97a-8ba9bddc3587

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