Graham Thiele2026-03-222026-03-22199910.1016/s0305-750x(98)00128-4https://doi.org/10.1016/s0305-750x(98)00128-4https://andeanlibrary.org/handle/123456789/43256Citaciones: 145enInformal sectorIntervention (counseling)Formal systemAgroforestryBusinessPolitical scienceEconomic growthInformal potato seed systems in the Andes: Why are they important and what should we do with them?article