Towards precision determination of unintegrated Parton Density Functions
  First attempts are described to determine the unintegrated Parton Density Function of the gluon from a fit to measurements of the structure function $F_2(x,Q^2)$ and also $F_2^c(x,Q^2)$ measured at HERA. Reasonable descriptions of both structure functions are obtained, but the gluon densities determined are different. 
H. Jung (DESY), A.V. Kotikov (JINR, Dubna), A.V. Lipatov (SINP, Msu),   N.P. Zotov (SINP, Msu)