1. Büchel G, Pirrung M (1993) Tertiary maars of the Hocheifel Volcanic Field, Germany. In: Negendank JFW, Zolitschka B (eds) Paleolimnology of European maar lakes. Springer, Berlin, pp 447–465
2. Burgess SM (ca 1987) The climate and weather of Western Samoa. New Zealand Meteorological Service Miscellaneous Publication 188(8)
3. Chesner CA (2012) The Toba Caldera Complex. Quat Int 258:5–18
4. Christenson BW, Németh K, Rouwet D, Tassi F, Vandemeulebrouck J, Varekamp JC (2015) Volcanic lakes. In: Rouwet D, Christenson BW, Tassi F, Vandemeulebrouck J (eds) Volcanic lakes. Springer, Berlin, pp 1–20
5. Cohen AS (2003) Paleolimnology: the history and evolution of lake systems. Oxford University Press, New York