Communicationes Instituti Forestalis Fenniae - Selaus tekijän mukaan "Helle, Timo"
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Prescribed burning from the viewpoint or reindeer husbandry.
Helle, Timo; Aspi, Jouni
Communicationes Instituti Forestalis Fenniae : 120 (1984) -
The winter use of food resources of semi domestic reindeer in northern Finland.
Helle, Timo; Saastamoinen, Olli
Metsäntutkimuslaitoksen julkaisuja (Metsäntutkimuslaitos, 1979)