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Measuring the willingness to pay for social services in developing countries / Paul Gertler, Jacques van der Gaag Monografia Publication Washington : The World Bank, 1988 Description VII, 30 p. ; 30 cm LocationBiblioteca Geral da Universidade do Minho Availability Available (1).

The willingness to pay for medical care : evidence from two developing countries / Paul Gertler, Jacques van der Gaag Monografia Publication Baltimore : The Johns Hopkins University Press, 1990 Description IX, 139 p. : il. ; 24 cm LocationBiblioteca Geral da Universidade do Minho Availability Available (1).