@unpublished{TUW-219258, author = {Krasna, Hana and B{\"o}hm, Johannes and Schuh, Harald}, title = {Free Core Nutation parameters from VLBI}, year = {2013}, note = {talk: 17th International Symposium on Earth Tides, Warsaw, Poland; 2013-04-15 -- 2013-04-19} }