Bolzano, Bernard: Erster Abschnitt. Von den Zeichen, die wir in einem Lehrbuche den Lesern selbst vorschlagen sollen. §640 - §648. (German). In: Bolzano, Bernard: Wissenschaftlehre. 4. (German). Sulzbach: J.E. v Seidel, 1837. pp. 504-517

Schechtman, V. V.: Riemann-Roch theorem after D. Toledo and Y.-L. Tong. (English). In: Bureš, J. and Souček, V. (eds.): Proceedings of the Winter School "Geometry and Physics". Circolo Matematico di Palermo, Palermo, 1989. pp. [53]-81

Atsuji, M.: On normality of the product of two spaces. (English). In: Novák, Josef (ed.): General topology and its relations to modern analysis and algebra IV, Proceedings of the fourth Prague topological symposium, 1976. Part B: Contributed Papers. Society of Czechoslovak Mathematicians and Physicist, Praha, 1977. pp. [25]-27