Geodesic
On a~product of classes of algebraic systems
Buletinul Academiei de Ştiinţe a Republicii Moldova. Matematica, no. 1 (2010), pp. 106-120.

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This paper defines a product of classes of algebraic systems and proves that it is a universal class, a quasi-variety or variety if these classes are universal classes, quasi-varieties or varieties, respectively. 
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Vasile I. Ursu. On a~product of classes of algebraic systems. Buletinul Academiei de Ştiinţe a Republicii Moldova. Matematica, no. 1 (2010), pp. 106-120. https://geodesic-test.mathdoc.fr/item/BASM_2010_1_a9/

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