(a, 1)f structures on product of spheres

Our aim in this paper is to give some examples of $(a,1)f$ Riemannian structures (a generalization of an $r$-paracontact structure) induced on product of spheres of codimension $r$ ($r\in \{1,2\}$) in an $m$-dimensional Euclidean space ($m>2$), endowed with an almost product structure.