Source: https://www.researchgate.net/profile/Neal-Hockley/publication/239280103_A_Social_Cost-Benefit_Analysis_of_Conserving_the_Ranomafana-_Andringitra-Pic_d'Ivohibe_Corridor_in_Madagascar/links/0046352d00b30c437e000000/A-Social-Cost-Benefit-Analysis-of-Conserving-the-Ranomafana-Andringitra-Pic-dIvohibe-Corridor-in-Madagascar.pdf