by R. Tyrrell Rockafellar. R. Tyrrell Rockafellar. R.Tyrrell Rockafellar Asen L.Dontchev, R.Tyrrell Rockafellar. by A. Hellawell. Asen L. Dontchev, R. Tyrrell Rockafellar R.T. Rockafellar. by C. Tyrrell Lewis