%A ?. ?. ????? %J International Conference dedicated to 120-th anniversary of STEFAN BANACH 17 ? 21 September 2012, Lviv, Ukraine %T On hyperholomorphic functions of spatial variable %X We proved a theorem about integral of quaternionic-differentiable functions of spatial variable over the closed surface. It is an analog of the Cauchy theorem from complex analysis. %P 132 %D 2012 %I Department of Mechanics and Mathematics, Ivan Franko National University of Lviv %L zu28632