Analysis of information sources in references of the Wikipedia article "Hermann Friese" in English language version.
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: CS1 maint: bot: original URL status unknown (link), Gazeta Esportiva, ca. 2002, (via Wayback Machine){{cite web}}
: CS1 maint: bot: original URL status unknown (link), Sindicato dos Árbitros de Futebol do Estado de São Paulo (via Wayback Machine)