Saltzberg, Edward W. “To Combine or Not To Combine An In-Depth Review of Standard and Combined Hydronic Systems and Their Various Pitfalls”. Journal of the National Academy of Forensic Engineers 10, no. 2 (January 1, 1993). Accessed November 23, 2024. https://journal.nafe.org/ojs/index.php/nafe/article/view/517.