query,deformations

Let A be an augmented algebra then Hoch(A,k) \iso Ext_A(k,k) where k is the target of the augmentation can be computed as the cohomology of Hom_k(BA,A) so the Gerstenhaber cup product is the Yoneda product is the product induced from the ususal diagonal on BA BUT where in the literature is this ever discussed?? jim +++++++++++++++++++++++++++++++++