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WikiPedia: Khóc http://www.theage.com.au/articles/2003/08/27/10616... http://linkinghub.elsevier.com/retrieve/pii/0010-4... //www.ncbi.nlm.nih.gov/pubmed/8339540 http://www.independent.ie/lifestyle/boys-dont-cry-... http://d-nb.info/gnd/4132375-0 //dx.doi.org/10.1016%2F0010-440X(93)90049-A http://familymatters.vision.org/public/item/223553 https://commons.wikimedia.org/wiki/Category:Crying...