[en] A parametrization of the missing mass distribution in an inclusive process a + b→c + X is proposed. On the basis of K+ + p→K0 + X, K+ + p→π+ + (K0 + X), K+ + p→PI tilde + (K0 + X) data at 5 and 8.2 GeV/c, it is found that the proposed distribution scales better than the Feynman invariant cross-section and has a simple exponential form. (author)