editors, G. Giraldo and E. Beth. editors, G. Szabo and Z. Papp. editors, M. Che and G.C. Bond. editors, G. Gialdroni Grassi and L.D. Sabath. editors, G. Comte-Bellot & J. Mathieu. editors, P. Emmelot and E. Kriek. editors, G. von Bally and P. Greguss. editor, F. G. Bell. editor, Jerome M. Vaeth. editors, A. Pecile, E. E. Muller