| 1 | 지역난방 열사용시설 핸드북, 한국지역난방공사, 2013. |
| 2 | www.eurogas.com |
| 3 | https://nest.com |
| 4 | http://www.kdnavien.co.kr/ |
| 5 | http://www.encoredtech.com/ |
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