Virtala, M 1996: Harvesting a lichen - reindeer system in an uncertain environment. - Ecological Modelling89: 209-224. [RLL List # 165 / Rec.# 19797] Keywords: BIOMASS/ FOOD/ HERBIVORE/ REINDEER
Abstract: 6 fig. many formulae ["It is found that the optimal harvesting rule can be expressed as a function of lichen biomass only."]