Michel Emery ; with an appendix by P.A. Meyer. D. H. Sattinger ; with an appendix by P. Olver. C. Truesdell ; with an appendix by C.-C. Wang. Matthias Kreck ; with an appendix by Neal W. Stoltzfus. Serge Lang ; [with an appendix by Karl Rubin]. by Edwin Edser ; reprinted with an appendix by N.M. Bligh.