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• Boillat, J. E.: Constante de Cheeger et première valeur propre non nulle du Laplacien d’un graphe de petite dimension. (French) [Cheeger constant and first nonzero eigenvalue of the Laplacian of a graph of small dimension]. Czechoslovak Mathematical Journal, vol. 43 (1993), issue 2, pp. 205-219
• Kôzaki, Masanori; Sumi, Hidekichi: On normal forms of Laplacian and its iterations in harmonic spaces. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 30 (1989), issue 4, pp. 795-802
• Gindikin, S. G.: Integral geometry for complexes of rational curves. (English). In: Bureš, J. and Souček, V. (eds.): Proceedings of the Winter School "Geometry and Physics". Circolo Matematico di Palermo, Palermo, 1989. pp. [195]-207
• Kisyński, Jan: On semigroups of operators generated by second order differential operators on Lie groups. (English). In: Frolík, Z. (ed.): Abstracta. 6th Winter School on Abstract Analysis. Czechoslovak Academy of Sciences, Praha, 1978. pp. 61-62