2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/81155Using mainly $\vec{p}$ p $\to$ p ${π^+}X$ and $\vec{p}$ p $\to$ p$_{f}$~p$_{s}$ X reactions, narrow baryonic structures were observed in the mass range 950$\le$ M $\le$ 1800 MeV.9 pages, 9 figures, 1 table, revtex, to be published in Proceedings of the XVI International Baldin Seminar on High Energy Physics Problems, Dubna 10-15 june 2002Nuclear Experimenttext