16D15 
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Karabacak, F.; Tercan, A.:
		Matrix rings with summand intersection property.
		
			(English).
Czechoslovak Mathematical Journal,
		vol. 53
			(2003),
			issue 3,
		pp. 621-626
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Henriksen, M.; Larson, S.; Smith, F. A.:
		When is every order ideal a ring ideal?.
		
			(English).
Commentationes Mathematicae Universitatis Carolinae,
		vol. 32
			(1991),
			issue 3,
		pp. 411-416
 
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