%0 Journal Article %T Categorical Groups, Knots and Knotted Surfaces %A Joao Faria Martins %J Mathematics %D 2005 %I arXiv %R 10.1142/S0218216507005713 %X We define a knot invariant and a 2-knot invariant from any finite categorical group. We calculate an explicit example for the Spun Trefoil. %U http://arxiv.org/abs/math/0502562v2