1. Extensions of Jentzch's theorem;Birkhoff;Trans. Amer. Math. Soc,1957
2. Lattice Theory;Birkhoff,1967
3. The Concept of a Stable Population: Applications to the Study of Countries with Incomplete Demographic Statistics;Bourgeois-Pichat;United Nations, Department of Economic and Social Affairs, Population Studies, No. 39, ST/SOA/ Series A/39,1968
4. Hilbert's metric and positive contraction mappings in a Banach space;Bushell;Arch. Rational Mech. Anal,1973
5. The Growth and Structure of Human Populations: A Mathematical Investigation;Coale,1972