Energy expenditure in work with hole-diggers as related to some of the construction parameters of these machines
M HubacForestry Research Institute at B. Stiavnica, SlovakiaI BorskýForestry Research Institute at B. Stiavnica, SlovakiaF StrelkaForestry Research Institute at B. Stiavnica, SlovakiaE. StarekForestry Research Institute at B. Stiavnica, Slovakia
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