16A38 
- 
Volkov, Michael V.:
		Varieties of associative rings closed under ideal sums.
		
			(English).
Commentationes Mathematicae Universitatis Carolinae,
		vol. 24
			(1983),
			issue 1,
		pp. 101-103
- 
Beĭdar, Konstantin Igorjevič:
		Идемпотенты в кольцах с полиномиальным тождеством.
		
			(Russian) [Idempotents in rings with a polynomial identity].
Commentationes Mathematicae Universitatis Carolinae,
		vol. 22
			(1981),
			issue 4,
		pp. 755-759
- 
Gardner, Barry J.:
		A note on ring epimorphisms and polynomial identities.
		
			(English).
Commentationes Mathematicae Universitatis Carolinae,
		vol. 20
			(1979),
			issue 2,
		pp. 293-307
- 
Gardner, Barry J.:
		Ring varieties closed under ideal sums.
		
			(English).
Commentationes Mathematicae Universitatis Carolinae,
		vol. 18
			(1977),
			issue 3,
		pp. 569-578
 
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