“…Subsequent complex research into the Choigan springs was performed by the members of the Tuva Complex Department (at present, Tuva Institute of Complex Exploration of Natural Resources), Kyzyl, under the guidance of Dr. K.D. Arakchaa Arakchaa et al (1996Arakchaa et al ( , 2011Arakchaa et al ( , 2012a. In summer of 2007 and in the next years, the investigation into the chemical and gas composition of the Tuva springs, including carbon dioxide waters, was continued by the researchers of the Tuva Institute of Complex Exploration of Natural Resources, Kyzyl, with the participation of the Laboratory of Geochemistry of Tomsk Polytechnic University (Kopylova et al, 2009bPashagin, 2011;Rychkova et al, 2007.…”