F2c at low x
  We study the heavy-quark contributions to the proton structure function F2(x,Q2) at next-to-leading order using compact formulas at small values of Bjorken's x variable. The formulas provide a good agreement with the modern HERA data for F2c(x,Q2). 
A.Yu. Illarionov and A.V. Kotikov
hep-ph