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 در سال 1973 
 گوستافسون
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	 	 	$[1]$R.Dark and C.M.Scoppola, On Camina groups of prime power order,  \textbf{  181 }   J.Algebra     ( 1996) , 787-802.  	
	 	 	$[1]$R.Dark and C.M.Scoppola, On Camina groups of prime power order,     181 J.Algebra     ( 1996) , 787-802.
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