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2. Scott, N, R, Parsons, R, A, Koehler, T, A, Analysis and performance of an earth aid heat exchanger, 65-840, 1965
3. Underground air cooling;Barbari,1984
4. Tempering ventilation air with earth-tube heat exchangers in swine production;Muheling,1984
5. Toepassing van de bodemwarmtewisselaar in de vleesvarkensstal (Subsoil heat exchanger for piggeries);Maton,1985