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What robots txt entry would you use to block crawlers?

Focused crawler

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Proceedings Article•DOI BoobyTrap: On autonomously detecting and characterizing crawlers in P2P botnets Shankar Karuppayah, Emmanouil Vasilomanolakis, Steffen Haas, Max Mühlhäuser, Mathias Fischer - Show less +4 more 22 May 2016 14 Citations	Our results indicate that we can distinguish many crawlers from benign bots.
Open access•Book Chapter•DOI Computing pagerank in a distributed internet search system Yuan Wang, David J. DeWitt - Show less +1 more 31 Aug 2004 83 Citations	This paper argues that using crawlers has a list of disadvantages.
Journal Article•DOI Web Crawler: Extracting the Web Data Mini Ahuja, Jatinder Singh Bal, Var nica - Show less +2 more 25 Jul 2014-International Journal of Computer Trends and Technology 23 Citations	These web crawlers can also be used in further research activities.
Proceedings Article•DOI Semantic Similarity Based Focused Crawling Mehdi Ravakhah, Mohsen Kamyar - Show less +1 more 23 Jul 2009 12 Citations	In this paper we propose a new algorithm used to classify in focused crawlers.
Open access•Proceedings Article•DOI A survey in semantic web technologies-inspired focused crawlers Hai Dong, Farookh Khadeer Hussain, Elizabeth Chang - Show less +2 more 01 Nov 2008 23 Citations	In the face of the inundant spam Websites, traditional Web crawlers cannot function well to solve this problem.

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