@article{popov_2009, 
  title={Invariant color calculus and generalized Balitsky-Kovchegov hierarchy}, 
  volume={79}, 
  DOI={10.1103/physrevd.79.014020}, 
  publisher={American Physical Society (APS)}, 
  author={Popov}, 
  year={2009}, 
  month={Jan}
  }