Michael P. Bishop; Helgi Björnsson; Wilfried Haeberli; Johannes Oerlemans; John F. Shroder; Martyn Tranter (2011), Singh, Vijay P.; Singh, Pratap; Haritashya, Umesh K. (eld.), Encyclopedia of Snow, Ice and Glaciers, Springer Science & Business Media, p. 1253, ISBN 978-90-481-2641-5