http://www.javaprobooks.ru/java-%D0%BF%D1%80%D0%BE%D0%B3%D1%80%D0%B0%D0%BC%D0%BC%D0%B8%D1%80%D0%BE%D0%B2%D0%B0%D0%BD%D0%B8%D0%B5/java-collections-set-%D0%B8%D1%81%D0%BF%D0%BE%D0%BB%D1%8C%D0%B7%D0%BE%D0%B2%D0%B0%D0%BD%D0%B8%D0%B5-%D0%BA%D0%BE%D0%BB%D0%BB%D0%B5%D0%BA%D1%86%D0%B8%D0%B9-%D0%B2-java.html
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06.11.2013 в 23:46www.seostella.com/ru/article/2012/08/09/kollekc...
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13.11.2013 в 19:28www.devbug.info/2011/10/java.html
www.silicateillusion.org/2012/01/17/java-enumer...