@article{TUW-219290, author = {Krasna, Hana and B{\"o}hm, Johannes and Schuh, Harald}, title = {Free core nutation observed by VLBI}, journal = {Astronomy {\&} Astrophysics}, year = {2013}, volume = {555}, number = {A29}, pages = {1--5}, doi = {10.1051/0004-6361/201321585} }