@Article{BorndoerferFerreiraMartin98,
author = "R.~Bornd{\"o}rfer and C.E.~Ferreira and A.~Martin",
title = {Decomposing Matrices into Blocks},
journal = "SIAM Journal on Optimization",
year = "1998",
volume = "9",
pages = "236 -- 269",
}