Embedding cocyclic D-optimal designs in cocyclic Hadamard matrices
  In this paper a method for embedding cocyclic submatrices with ``large'' determinants of orders 2t in certain cocyclic Hadamard matrices of orders 4t is described (t an odd integer). If these determinants attain the largest possible value, we are embedding D-optimal designs. Applications to the pivot values that appear when Gaussian Elimination with complete pivoting is performed on these cocyclic Hadamard matrices are studied. 
V\'ictor \'Alvarez, Jos\'e-Andr\'es Armario, Mar\'ia-Dolores Frau and   F\'elix Gudiel
math.CO