The fraction of Bose-Einstein condensed triplons in TlCuCl3 from   magnetization M(T,H)-data
  In this study we calculate the fraction of condensed magnetic quasiparticles of TlCuCl3 from magnetization M(T,H)-data. It is independent of the direction of the magnetic field and slightly decreases with increasing magnetic field. 
R. Dell'Amore, K. Kr\"amer and A.Schilling