1452 20160222141727.0 SIDCimport-1741 Cliver, E.W. 2015 Recalibrating the Sunspot Number (SN): The 3rd and 4th SN Workshops STCE Clette, F. Svalgaard, L. Vaquero, J.M. Central European Astrophysical Bulletin 39 2015 1-19 http://cdsads.u-strasbg.fr/cgi-bin/nph-iarticle_query?2015CEAB...39....1C&data_type=PDF_HIGH&whole_paper=YES&type=PRINTER&filetype=.pdf published in REFERD