Are smallholders willing to pay for animal disease control? Empirical evidence from a study of mass vaccination for Avian Influenza in Indonesia - Lapar, Ma. Lucila; Toan, N.N.; Nuryartono, N.; Bett, Bernard K.; McLaws, M.; Schoonman, L.; Jost, Christine; Unger, Fred; Mariner, Jeffrey C. (2011)