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Summary.Using the quadratic response function at the ab initio SCF level of approximation we have calculated the relativistic corrections from the spinorbit Hamiltonian, HSO, to the indirect nuclear spinspin coupling constants of XH4 (X=C, Si, Ge, and Sn). We find that the spinorbit contributions to JXH are small, amounting only to about 1% for JSnH. For the geminal HH coupling constants the relativistic...