Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) S.L. Smith and V.E. Romanovsky and A.G. Lewkowicz and C.R. Burn and M. Allard and G.D. Clow and K. Yoshikawa and J. Throop,Thermal state of permafrost in North America: a contribution to the international polar year,Permafrost and Periglacial Processes,1045-6740,Wiley,2010-04,21,2,117-135,https://cir.nii.ac.jp/crid/1362544419537706240,https://doi.org/10.1002/ppp.690