@article{zu213306,
           title = {On the Zygmund-type estimate for a quaternion singular Cauchy integral},
          author = {?. ?. ?????},
            year = {2013},
         journal = {?????????? ???????????  "??????????? ??????, ?????? ?????????? ?? ?? ????????????"},
             url = {http://eprints.zu.edu.ua/13306/},
        abstract = {We established in sufficient conditions for existence of the integralF[f] ona regular surface and proved an upper Zygmund-type estimate for its modulus ofcontinuity in terms of the modulus of continuity of the function f}
}