1. Introduction to Matrix Analysis;Bellman,1970
2. Über Integralgleichungen mit Positiven Kern;Jentzsch;J. Reine Angew. Math.,1912
3. Functional Integrals in Statistical Mechanics;Siegert,1962
4. Functional Integrals in Statistical Mechanics;Siegert,1962
5. Study of several lattice systems with long range forces;Kac;J. Math. Phys.,1963