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[2] Friese, M.; Wanka, E.: Fuel saving in industrial drying processes with the Vapormid method. ZKG, 4/1992, pp. 194-196

[3] Wanka, E.: NOx reduction by intermolecular electron transfer in the rotary kiln flame. ZKG, 10/1996,
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[4] Haas, G.; Riedl, F.; Wanka, E.: Primary energy savings in oil and gas fired boiler system. Trade Journal Brewery, 22/1987, pp. 1005 and 1017-1018

[5] Wanka, E.: Long-term trial with one Vapormid ion generator at the Bitburger brewery Th. Simon GmbH. Trade Journal Brewery, 47-48/1989, pp. 2367-2368

[6] Patent specification No. P 44 07 640.1 dated 14. September 1995

[7] Press release EES (2017): in-house publication, 2 pages, available on request

[8] Patent specification No. 10.2017 004 277.2, March 2018