2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/73236This article was originally published in Topology 31 (1992). The present hyperTeXed redaction corrects a few typographical errors and updates the references.8 pages, 5 figuresGeometric Topology57M25A characterization of quasipositive Seifert surfaces (Constructions of quasipositive knots and links, III)text