1) http: //ppt4web.ru/khimija/poluchenie-galogenov-biologicheskoe-znachenie-i-primenenie-galogenov.html2) http: //estnauki.ru/himiya/46-neorganicheskaja-himija/2337-poluchenie-i-primenenie-galogenov.html3) http: //school.xvatit.com/index.php? title=%D0%9F%D0%BE%D0%BB%D1%83%D1%87%D0%B5%D0%BD%D0%B8%D0%B5_%D0%B3%D0%B0%D0%BB%D0%BE%D0%B3%D0%B5%D0%BD%D0%BE%D0%B2._%D0%91%D0%B8%D0%BE%D0%BB%D0%BE%D0%B3%D0%B8%D1%87%D0%B5%D1%81%D0%BA%D0%BE%D0%B5_%D0%B7%D0%BD%D0%B0%D1%87%D0%B5%D0%BD%D0%B8%D0%B5_%D0%B8_%D0%BF%D1%80%D0%B8%D0%BC%D0%B5%D0%BD%D0%B5%D0%BD%D0%B8%D0%B5_%D0%B3%D0%B0%D0%BB%D0%BE%D0%B3%D0%B5%D0%BD%D0%BE%D0%B2_%D0%B8_%D0%B8%D1%85_%D1%81%D0%BE%D0%B5%D0%B4%D0%B8%D0%BD%D0%B5%D0%BD%D0%B8%D0%B94) http: //base.safework.ru/iloenc? navigator& spack=110LogLength%3D0%26LogNumDoc%3D857300024%26listid%3D010000000100%26listpos%3D20%26lsz%3D40%26nd%3D857300024%26nh%3D1%265) http: //ido.tsu.ru/schools/chem/data/res/neorg/uchpos/text/g3_3_11.html