Celebratio Mathematica

W. Miller, Jr.: Sym­metry and sep­ar­a­tion of vari­ables. En­cyc­lo­pe­dia of Math­em­at­ics and its Ap­plic­a­tions 4. Ad­dis­on-Wes­ley, 1977. With a fore­word by Richard As­key. This was re­prin­ted in 2011. MR 460751 Zbl 0368.​35002 book

W. Miller, Jr.: Sym­metry and sep­ar­a­tion of vari­ables, Re­print edition. En­cyc­lo­pe­dia of Math­em­at­ics and its Ap­plic­a­tions 4. Cam­bridge Uni­versity Press, 2011. With a fore­word by Richard As­key. Re­prin­ted edi­tion of 1977 ori­gin­al. Zbl 1223.​35006 book