Helmens, K.F. and Salonen, S.J. and Plikk, A. and Engels, Stefan and Valiranta, M. and Kylander, M. and Brendryen, J. and Renssen, H. (2015) Major cooling intersecting peak Eemian Interglacial warmth in northern Europe. Quaternary Science Reviews 122 , pp. 293-299. ISSN 0277-3791.

Helmens, K.F. and Valiranta, M. and Engels, Stefan and Shala, S. (2012) Large shifts in vegetation and climate during the Early Weichselian (MIS 5d-c) inferred from multi-proxy evidence at Sokli (northern Finland). Quaternary Science Reviews 41 , pp. 22-38. ISSN 0277-3791.

Engels, Stefan and Helmens, K.F. and Valiranta, M. and Brooks, S.J. and Birks, H.J.B. (2010) Early Weichselian (MIS 5d and 5c) temperatures and environmental changes in northern Fennoscandia as recorded by chironomids and macroremains at Sokli, northeast Finland. Boreas 39 (4), pp. 689-704. ISSN 0300-9483.

Valiranta, M. and Birks, H.H. and Helmens, K.F. and Engels, Stefan and Piirainen, M. (2009) Early Weichselian interstadial (MIS 5c) summer temperatures were higher than today in northern Fennoscandia. Quaternary Science Reviews 28 (9-10), pp. 777-782. ISSN 0277-3791.