Andersson O. Innovative and cost-effective cold storage applications in Sweden : IEA Annex 7 / O.Andersson,S.Johansson,B.Nordell, 1994. - 17,7 p. p. - Текст : непосредственный.
Nordell B. borehole heat store in rock at the University of Lulea : The Lulev@:arme project 1982-1988 / B.Nordell, 1990. - 56 p. - Текст : непосредственный.