Luoto, T.P., Helama, S. & Nevalainen, L. 2013. Stream flow intensity of the Saavanjoki River, eastern Finland, during the past 1500 years reflected by mayfly and caddisfly mandibles in adjacent lake sediments. Journal of Hydrology 476: 147-153. [CrossRef]
Helama, S. 2012. A review of citation patterns in doctoral dissertations at the Department of Geology, University of Helsinki, Finland, since 1896. Science & Technology Libraries 31(2): 180-189. [CrossRef]
Helama, S. & Holopainen, J. 2012. Spring temperature variability relative to the North Atlantic Oscillation and sunspots - A correlation analysis with a Monte Carlo implementation. Palaeogeography, Palaeoclimatology, Palaeoecology 326-328: 128-134. [CrossRef]
Helama, S., Bégin, Y., Vartiainen, M., Peltola, H., Kolström, T. & Meriläinen, J. 2012. Quantifications of dendrochronological information from contrasting microdensitometric measuring circumstances of experimental wood samples. Applied Radiation and Isotopes 70(6): 1014-1023. [CrossRef]
Helama, S., Hyttinen, O. & Salonen, V.-P. 2012. Late Weichselian varve archives re-explored to assess proglacial sedimentary chronologies using the principles of tree-ring analysis. Progress in Physical Geography 36(2): 188-209. [CrossRef]
Helama, S., Läänelaid, A., Raisio, J. & Tuomenvirta, H. 2012. Mortality of urban pines in Helsinki explored using tree rings and climate records. Trees - Structure and Function 26(2): 353-362. [CrossRef]
Helama, S., Seppä, H., Bjune, A.E. & Birks, H.J.B. 2012. Fusing pollen-stratigraphic and dendroclimatic proxy data to reconstruct summer temperature variability during the past 7.5 ka in subarctic Fennoscandia. In: Kaufman, D.S. (ed.). Holocene paleoenvironmental records from Arctic lake sediment. Journal of Paleolimnology 48(1): 272-286. [CrossRef]
Holopainen, J. & Helama, S. 2012. Suomen keskiajan kivikirkot pikku jääkauden kourissa. Alue ja Ympäristö 41(1): 108-112. [url]
Holopainen, J., Rickard, I.J. & Helama, S. 2012. Climatic signatures in crops and grain prices in 19th-century Sweden. Holocene 22(8): 939-945. [CrossRef]
Läänelaid, A., Helama, S., Kull, A., Timonen, M. & Jaagus, J. 2012. Common growth signal and spatial synchrony of the chronologies of tree-rings from pines in the Baltic Sea region over the last nine centuries. In: Helama S. & Devall M.S. (eds.). World Dendro 2010. Dendrochronologia 30(2): 147-155. [CrossRef]
Macias-Fauria, M., Grinsted, A., Helama, S. & Holopainen, J. 2012. Persistence matters: Estimation of the statistical significance of paleoclimatic reconstruction statistics from autocorrelated time series. In: Helama S. & Devall M.S. (eds.). World Dendro 2010. Dendrochronologia 30(2): 179-187. [CrossRef]
Nielsen, J.K. & Helama, S. 2012. Christian Theodor Vaupell, a Danish 19th century naturalist and a pioneering developer of the Quaternary geoscience. History of Geo- and Space Sciences 3(2): 143-150. [CrossRef]
Tian, Q.H., Zhou, X.J., Gou, X.H., Zhao, P., Fan, Z.X. & Helama, S. 2012. Analysis of reconstructed annual precipitation from tree-rings for the past 500 years in the middle Qilian Mountain. Science China Earth Sciences 55(5): 770-778. [CrossRef]
Büntgen, U., Raible, C.C., Frank, D., Helama, S., Cunningham, L., Hofer, D., Nievergelt, D., Verstege, A., Timonen, M., Stenseth, N. & Esper, J. 2011. Causes and consequences of past and projected Scandinavian summer temperatures, 500-2100 AD. PLoS ONE 6(9): e25133. [CrossRef]
Helama, S. 2012. Professori Matti Sauramo Äänislinnassa. Abstract: Professor Matti Sauramo in Äänislinna, East Karelia. Geologi 64(2): 28-38. [pdf]
Helama, S. 2012. Book Review: Dendroclimatology. Progress and Prospects. Malcolm K. Hughes, Thomas W. Swetnam, Henry F. Diaz (Eds.) Developments in Paleoenvironmental Research, Vol. 11. 1st Edition, 2011, XII, 365 p. Hardcover, ISBN 978-1-4020-4010-8. Archaeological and Anthropological Sciences 4(3): 237-239. [CrossRef]
Helama, S. & Devall, M.S. 2012. Tree-ring science under the midnight sun: Papers from the 8th International Conference on Dendrochronology-WorldDendro 2010. In: Helama S. & Devall M.S. (eds.). World Dendro 2010. Dendrochronologia 30(2): 67-68. [CrossRef]
Holopainen, J., Gregow, H., Helama, S., Kubin, E., Lummaa, V. & Terhivuo, J. 2012. Suomen kasvifenologisista havainnoista 1700-luvun puolivälistä nykypäivään. (History of Finnish plant phenological observations since the 1750s). Sorbifolia 43(2): 51-66.
Mielikäinen, K., Timonen, M. & Helama, S. 2012. Ilmastonmuutokset ja niiden syyt puulustojen ja muiden proksitietojen pohjalta. Julkaisussa: Asikainen, A., Ilvesniemi, H., Sievänen, R., Vapaavuori, E. & Muhonen, T. (toim.). Bioenergia, ilmastonmuutos ja Suomen metsät. Metlan työraportteja / Working Papers of the Finnish Forest Research Institute 240: 32-52. ISBN 978-951-40-2378-1 [html]
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