%A ?. ?. ????? %J Journal of Mathematical Sciences %T On the Cauchy theorem for hyperholomorphic functions of spatial variable %X We proved a theorem about the integral of quaternionic-differentiable functions of spatial variable over the closed surface. It is an analog of the Cauchy theorem from complex analysis. %N 1 %K Quaternion, Dirac operator, differentiable function. %P 1-6 %D 2018 %I Springer Science+Business Media %L zu228408