1. Studies on the caribou lichen stands of New-foundland;Ahti,1959
2. Taxonomic studies on reindeer lichens (Cladonia, subgenus Cladina);Ahti,1961
3. Open boreal woodland subzone and its relation to reindeer husbandry;Ahti,1961
4. Stimulatory and inhibitory effects of needle litter and grass extracts on the growth of some ectomycorrhizal fungi;Baar,1994