Pauwels, Wilfried M. A. “A Mathematical Note.” Altruism, Morality, and Economic Theory, edited by Edmund S. Phelps, Russell Sage Foundation, New York, 1975, pp. 107–114, www.jstor.org/stable/10.7758/9781610446792.12. Accessed 21 Jan. 2021.
Pauwels, W. (1975). A Mathematical Note. In Phelps E. (Ed.), Altruism, Morality, and Economic Theory (pp. 107-114). New York: Russell Sage Foundation. Retrieved January 21, 2021, from http://www.jstor.org/stable/10.7758/9781610446792.12
Pauwels, Wilfried M. A. "A Mathematical Note." In Altruism, Morality, and Economic Theory, edited by Phelps Edmund S., 107-14. New York: Russell Sage Foundation, 1975. Accessed January 21, 2021. http://www.jstor.org/stable/10.7758/9781610446792.12.
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