1. J.M. Anthonisse, “Proportional representation in a regional council,” CWI Newsletter 5, Centrum voor Wiskunde en Informatica (Amsterdam, December 1984) 22–29.
2. M. Bacharach,Biproportional Matrices and Input-Output Change (Cambridge University Press, Cambridge, 1970).
3. M.L. Balinski and G. Demange, “An axiomatic approach to proportionality between matrices,”Mathematics of Operations Research (1989), to appear.
4. M.L. Balinski and H.P. Young,Fair Representation: Meeting the Ideal of One Man, One Vote (Yale University Press, New Haven, CT, 1982).
5. J. Bigelow and N. Shapiro, “A scaling theorem and algorithms,”SIAM Journal of Applied Mathematics 33 (1977) 348–352.