1. Bassett, L., Habibagahi, H., & Quirk, J. (1967). Qualitative economics and Morishima matrices. Econometrica, 35(2), 221–233.
2. Hadamard, J. (1903). Leçons sur la propagation des ondes et les équations de l’hydrodynamique, par Jacques Hadamard. Librairie Scientifique A. Hermann. ISBN-13: 978-2876472990. Reprinted by Nabu Press, 2010. ISBN-13: 978-1149097908.
3. Henderson, J., & Quandt, R. (1980). Microeconomic Theory: A mathematical approach. (2nd revised ed.). McGraw-Hill. ISBN-13: 978-007066321.
4. Kemp, M. C., & Kimura, Y. (1978). Introduction to mathematical economics. Springer-Verlag. ISBN-13: 978-1461262800.
5. Kojima, T. (1914). On a theorem of Hadamard’s and its Application. Tohoku Mathematical Journal, 5, 54–60.