http://en.wikipedia.org/wiki/Standing_wavehttp://www.physicsclassroom.com/class/waves/Lesson-4/Formation-of-Standi...http://hyperphysics.phy-astr.gsu.edu/hbase/waves/standw.htmlhttp://physics.info/waves-standing/http://www.britannica.com/EBchecked/topic/563065/standing-wave
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