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The use of willingness to pay experiments : estimating demande for piped water connections in Sri Lanka / Subhrendu K. Pattanyak... [et al.] Monografia Publication Washington : World Bank, 2006 Description 33, [14] p. : il. ; 28 cm LocationBiblioteca Geral da Universidade do Minho Availability Available (1).

Unpackaging demand for water service quality : evidence from conjoint surveys in Sri Lanka / Jui-Chen Yang... [et al.] Monografia Publication Washington : World Bank, 2006 Description 22, [8] p. : il. mapas ; 28 cm LocationBiblioteca Geral da Universidade do Minho Availability Available (1).