@article{ByrdGoulNoceWalt04:mp, journal = MPB,
 author = {R.  H. Byrd and N. I. M. Gould and J. Nocedal and R. A. Waltz},
 title  = {An algorithm for nonlinear optimization using linear programming
           and equality constrained subproblems},
 volume = 100, number = 1, pages = {27--48}, year = 2004}