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There are many previous researches on focused crawlers. Most of the crawlers are bionic: they gain energy for having scratched relevant pates to the query and lose energy otherwise; they reproduce when energy is high and they die when energy is out. This causes some crawlers in irrelevant area to die so relevant pages that are far to Seed Url may not be scratched and the crawlers' recall rate may...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.