Résumé : The inclusive production of K s 0, Λ and {Mathematical expression} particles is investigated in 70 GeV/c {Mathematical expression} interactions in an experiment performed at CERN using BEBC equipped with a TST. Differential cross-sections are studied and compared with corresponding data at surrounding energies. Differences with pp data obtained at the same energy allow an estimate of the K s 0, production cross-section in annihilation processes. Evidence is also given for central {Mathematical expression} production. © 1984 Springer-Verlag.