Pitman, G. “A Lichenometrical Study of Snow Patch Variation in the Frederikshåb District, South-West Greenland, and Its Implications for Studies of Climatic and Glacial Fluctuations”. Bulletin Grønlands Geologiske Undersøgelse, vol. 104, Aug. 1973, pp. 1-31, doi:10.34194/bullggu.v104.6645.