"Grayvoronsky" (به روسی). Federal State Statistics Service, Russian Federation. Archived from the original on 2 February 2017. Retrieved August 27, 2016.
"Об исчислении времени". Официальный интернет-портал правовой информации (به روسی). 3 June 2011. Retrieved 19 January 2019.
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"Grayvoronsky" (به روسی). Federal State Statistics Service, Russian Federation. Archived from the original on 2 February 2017. Retrieved August 27, 2016.