2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/141582In the paper we characterize, in terms of quivers and relations, the admissible algebras with formal two-ray modules introduced by G. Bobiński and A. Skowroński [Cent. Eur. J.Math.1 (2003), 457--476].Mainly correcting typos. Also a new abstract and minor changes in the introduction and subsection 3.1Representation TheoryRings and Algebras16G20, 16G60, 16G70text