@article{10_1090_S0894_0347_10_00661_2,
     author = {Merkurjev, Alexander},
     title = {Essential {\dh}‘-dimension of {{\dh}{\dh}†{\dh}‹({\dh}{\textcopyright}\^A{\texttwosuperior})}},
     journal = {Journal of the American Mathematical Society},
     pages = {693--712},
     publisher = {mathdoc},
     volume = {23},
     number = {3},
     year = {2010},
     doi = {10.1090/S0894-0347-10-00661-2},
     url = {http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-10-00661-2/}
}