1. Boehler M. Liebi C (2012): Reduzierter NaOH-Verbrauch bei der Ammoniak-Strippung durch den Einsatz einer vorgeschalteten CO2-Strippung – Betriebserfahrungen auf der ARA Kloten/Opfikon, 8. Aachener Tagung zur Stickstoffrückbelastung, Heidelberg, 03.07. – 04.07.2012
2. Boehler M, Schachtler M, Mohn J, Heisele A, Kunst W, Liebi C, Zullegg S, Siegrist H (2013): Full scale recovery of nitrogen from ammonia rich sludge liquid and urine for the production of fertilizer by full scale air stripping or membrane stripping, extended Abstract, proceedings of 10th IWA Leading edge Conference on Water and wastewater technologies, Bordeaux, 2 − 6 June 2013
3. Boehler M, Siegrist H, Seyfried A., Grömping M (2013): Ammonia Stripping from liquid side streams of sewage sludge processing and production of ammonium, book chapter 10 in Effective sewage sludge management − minimization, recycling of materials, enhanced stabilization, disposal after recovery, by Giuseppe Mininni, IRSA, CNR edizioni, Roma
4. Heisele A, Boehler M, Siegrist H (2014) N-removal from sludge liquid by means of a gas selective membrane—half scale pilot trials at WWTP Neugut, summery report, in German
5. Morales N, Boehler MA, Buettner S, Liebi C, Siegrist H (2013) Recovery of N and P from urine by Struvite precipitation followed by combined stripping with digester sludge liquid at full scale. Water 5(3):1262–1278