[en] A facility for multiparameter study of binary and ternary spontaneous fission is described, as well as mathematical apparatus for experimental data processing. The facility permits simultaneous registration in each individual fission event of the fragment kinetic energies, the number of neutrons emitted by complementary fragments and the long range particle kinetic energies in the case of ternary fission with equatorial and polar emission. The mathematical methods described make it possible to perform reconstruction and unfolding of the fragment masses and kinetic energies as well as the initial neutron multiplicity distributions. 10 refs.; 12 figs.; 1 tab