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Ernst MachTài liệu tham khảo
WikiPedia: Ernst_Mach http://vlp.mpiwg-berlin.mpg.de/people/data?id=per3... http://genealogy.math.ndsu.nodak.edu/id.php?id=113... http://academic.udayton.edu/gregelvers/hop/?m=3&a=... http://www.archive.org/search.php?query=creator:(E... http://www.marxists.org/archive/lenin/works/1908/m... https://plato.stanford.edu/entries/ernst-mach https://commons.wikimedia.org/wiki/Category:Ernst_...