edited by B. P. Straughan and S. Walker. edited by G. G. Birch and K. J. Parker. edited by A. S. Strub and H. Ehringer. edited by G.G.Gibson & R. Walker. edited by G.G. Birch and K.J. Parker. edited by Benjamin M. Walker. edited by J. Straub and K. Scheffler. edited by P. Skrabanek and A. Walsh. edited by M. V. K. Chari and P. P. Silvester. edited by C.R. Brundle and A.D. Baker.