@article{ElbersBuck2007,
  author    = {Gereon Elbers and Manfred Buck},
  title     = {Soot Concentration in Ambient Air / M. Buck, G. Elbers},
  journal   = {Erd{\"o}l \& Kohle, Erdgas, Petrochemie : EKEP. 45 (1992)},
  pages     = {219},
  year      = {2007},
}