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Birks, H. J. B.; Birks, H. H.; Ammann, Brigitta (2016). The fourth dimension of vegetation. Science, 354(6311), pp. 412-413. American Association for the Advancement of Science 10.1126/science.aai8737
Birks, H. H.; Ammann, Brigitta (2000). Two terrestrial records of rapid climatic change during the glacial-Holocene transition (14,000- 9,000 calendar years B.P.) from Europe. Proceedings of the National Academy of Sciences of the United States of America - PNAS, 97(4), pp. 1390-1394. National Academy of Sciences NAS 10.1073/pnas.97.4.1390
