Analytical solution of the longitudinal structure function $F_{L}$ in   the leading and next-to-leading-order analysis at low x with respect to   Laguerre polynomials method
  The aim of the present paper is to apply the Laguerre polynomials method for the analytical solution of the Altarelli- Martinelli equation. We use this method of the low $x$ gluon distribution to the longitudinal structure function using MRST partons as input. Having checked that this model gives a good description of the data to predict of the longitudinal structure function at leading and next to leading order analysis at low $x$ 
B.Rezaei and G.R.Boroun
hep-ph