@unpublished{TUW-233098, author = {Dorigo, Wouter and Gruber, Alexander}, title = {Long-term soil moisture observations from space - Where do we stand?}, year = {2014}, note = {invited; talk: ISSI International Team ''Adding value to soil moisture information for climate studies'' Meeting 1, Bern, Switzerland; 2014-11-24 -- 2014-11-26} }