??????? ???? (?? ??????? : Square kilometre ) ????? ???? ??????????? ??? ??? ? ?? km 2 ???? ???? ??????. ???? ???? ????? ?? SI ? ??? ???? ??? ? ??????????? ????? ?????? ??? ?? ?? ???. ??????? ???? ?? ???? ???? ????? ???. ? ??????? ???? ????? ??? ??:
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Wikipedia contributors, "Square kilometre," Wikipedia, The Free Encyclopedia, http://en.wikipedia.org/w/index.php?title=Square_kilometre&oldid=206943359
https://www.britannica.com/science/International-System-of-Units