https://link.springer.com/chapter/10.1007/3-540-44668-0_7?error=cookies_not_supported&code=24e70de2-1c6c-4fe0-ac1c-ea02221d04c1

https://link.springer.com/chapter/10.1007/3-540-44668-0_7?error=cookies_not_supported&code=24e70de2-1c6c-4fe0-ac1c-ea02221d04c1

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