1. Pipe design standards DIN 2605–2, DIN 2615-2, DIN 2616-2, DIN 28013.
2. Kelner Eric, Flow Meter Installation Effects, Presented at the American School of Gas Measurement Technology (2009) 12 pages.
3. Canada Pipeline Accessories, http://www.flowconditioner.com
4. Vortab Company, http://www.vortab.com
5. Westfall Manufacturing Company, http://westfallmfg.com/