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58G35 

• Tiller, Petr: The approximate symmetries of the vacuum Einstein equations. (English). In: Slovák, Jan (ed.): Proceedings of the 16th Winter School "Geometry and Physics". Circolo Matematico di Palermo, Palermo, 1997. pp. [163]-168
• Hinterleitner, Franz: Local and global aspects of separating coordinates for the Klein-Gordon equation. (English). In: Slovák, Jan (ed.): Proceedings of the 16th Winter School "Geometry and Physics". Circolo Matematico di Palermo, Palermo, 1997. pp. [97]-105
• Bureš, Jarolím: Special invariant operators I. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 37 (1996), issue 1, pp. 179-198
• Branson, Thomas P.: Conformal transformation, conformal change, and conformal covariants. (English). In: Bureš, J. and Souček, V. (eds.): Proceedings of the Winter School "Geometry and Physics". Circolo Matematico di Palermo, Palermo, 1989. pp. [115]-134
• Gazeau, J. P.; Hans, M.: Conformally invariant wave equations in $3+2$-de Sitter linear gravity. (English). In: Bureš, J. and Souček, V. (eds.): Proceedings of the Winter School "Geometry and Physics". Circolo Matematico di Palermo, Palermo, 1989. pp. [179]-194
• Krupka, Demeter; Mikolášová, Věra: On the uniqueness of some differential invariants: $d$, $[,]$, $\nabla$. (English). Czechoslovak Mathematical Journal, vol. 34 (1984), issue 4, pp. 588-597