1. Global gas report 2018. http://www.snam.it/export/sites/snam-rp/repository/file/gas_naturale/global-gas-report/global_gas_report_2018.pdf
2. Malek L, Hulteberg C (2016) Measuring and ensuring the gas quality of the Swedish gas grid. Energiforsk, p 38. https://portal.research.lu.se/portal/en/publications/measuring-and-ensuring-the-gas-quality-of-the-swedish-gas-grid(e8249698-1599-444f-992f-d6fb19a63b48).html
3. GOST 31369–2008 Gaz prirodnyj. Vychislenie teploty sgoranija, plotnosti, otnositel'noj plotnosti i chisla Vobbe na osnove komponentnogo sostava. Standartinform, Moscow, p 54 (In Russ.)
4. ISO 15971:2008 Natural gas—Measurement of properties—Calorific value and Wobbe index. https://www.iso.org/standard/44867.html
5. Dörr H, Koturbash T, Kutecherov V (2019) Review of impacts of gas qualities with regard to quality determination and energy metering of natural gas. Meas Sci Technol 30(4):022001. https://doi.org/10.1088/1361-6501/aaeef4