editors, G. von Bally and P. Greguss. editors, C. Bonnelle and C. Mande. editors, C. Vidal and A. Pacault. editors, E. Gerlach and P. Grosse. editors, G. Giraldo and E. Beth. editors, A. Crucq and A. Frennet. editors, G. Schmahl and D. Rudolph. editors, H. Latal and H. Mitter. editors, R. Vanselow and R. Howe. editors, W. Gr鑥ebler and V. K鑟nig.