Structure Function $F_L$ at Fixed $W$ in the $K_T$-Factorization   Approach
  The results for structure function $F_L$, obtained in the $k_T$-factorization and collinear approaches, are compared with recent H1 experimental data at fixed $W$ values. 
A.V. Kotikov, A.V. Lipatov, N.P. Zotov