Analysis of information sources in references of the Wikipedia article "Operation Menu" in English language version.
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{{cite web}}: CS1 maint: archived copy as title (link){{cite journal}}: CS1 maint: url-status (link) [permanent dead link]{{cite journal}}: CS1 maint: date and year (link){{cite web}}: CS1 maint: archived copy as title (link){{cite journal}}: CS1 maint: date and year (link)In April–May 1970, many North Vietnamese forces entered Cambodia in response to the call for help addressed to Vietnam not by Pol Pot, but by his deputy Nuon Chea. Nguyen Co Thach recalls: 'Nuon Chea has asked for help and we have liberated five provinces of Cambodia in ten days.'