The 4.2 ka event is not remarkable in the context of Holocene climate variability oleh Nicholas P. McKay, Darrell S. Kaufman, Stéphanie H. Arcusa, Hannah R. Kolus, David C. Edge, Michael P. Erb, Chris L. Hancock, Cody C. Routson, Maurycy Żarczyński, Leah P. Marshall, Georgia K. Roberts, Frank Telles