Clement, JP; White, KR; Valdmanis, V; (2002) Charity care: Do not-for-profits influence for-profits? Medical care research and review, 59 (1). pp. 59-78. ISSN 1077-5587 DOI: https://doi.org/10.1177/1077558702059001003 Full text not available from this repository.

Onwujekwe, O; Chima, R; Shu, E; Nwagbo, D; Akpala, C; Okonkwo, P; (2002) Altruistic willingness to pay in community-based sales of insecticide-treated nets exists in Nigeria. Social science & medicine (1982), 54 (4). pp. 519-27. ISSN 0277-9536 DOI: https://doi.org/10.1016/S0277-9536(01)00047-8 Full text not available from this repository.