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Friedman, liberalism and the meaning of negative freedom
Smith, Vardaman R., (1998)
Economic theory and natural philosophy : Charles Michael, Andres Clark, with foreword by Robert L. Heilbroner, (Edward Elgar Publishing Limited, Brookfield, VT) 1992.
Smith, Vardaman R., (1994)
Friedman, Liberalism and the Meaning of Negative Freedom