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[en] We consider the variety Al of all soluble groups of derived length at most l, l>=2. Suppose that a finitely generated group G is a free product in the variety Al of Abelian torsion-free groups. It is proved that the test rank of G is one less than the number of factors. A test set of elements is written out explicitly. Bibliography: 27 titles
Journal
Sbornik. Mathematics; ISSN 1064-5616; 
; v. 199(4); p. 495-510
; v. 199(4); p. 495-510