1). http://www.studytrails.com/frameworks/spring/spring-security-using-xml.jsp
2). http://websystique.com/spring-security/spring-security-4-hello-world-annotation-xml-example/
3). http://stackoverflow.com/questions/11815339/role-purpose-of-contextloaderlistener-in-spring
4). http://learningviacode.blogspot.ru/2012/11/springs-contextloaderlistener.html
5). http://learningviacode.blogspot.ru/2012/11/basic-mvc-application-in-spring.html
6). http://stackoverflow.com/questions/9016122/contextloaderlistener-or-not
7). https://spring.io/guides/gs/authenticating-ldap/
8). http://learningviacode.blogspot.ru/2013/08/spring-security.html
9). http://learningviacode.blogspot.ru/2013/10/spring-security-login-flow.html