[en] The four-momentum distributions of fireballs originating from a given primary fireball are calculated for every generation of the decay process. This is done both by using the general-bootstrap model, which allows emission of all kinds of fireballs, and by using the linear-bootstrap model, in which only pions are emitted. Considerable differences are found between these models in the predictions for the four-momentum distributions. For example, in the linear model the length of the decay chain depends linearly on the mass of the primary fireball, while in the general model it depends linearly on the square root of the mass