https://link.springer.com/chapter/10.1007/3-540-46020-9_5?error=cookies_not_supported&code=ab927b2b-fc07-43a6-8b4f-d233f9293d28

https://link.springer.com/chapter/10.1007/3-540-46020-9_5?error=cookies_not_supported&code=ab927b2b-fc07-43a6-8b4f-d233f9293d28

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