@manual{Greinert:2019,
  author  = "A. Greinert and J. Kostecki and M. Mrówczyńska and W. Szefner",
  title  = "Paliwa stałe - logo, Patent #: RCD 007403878",
  note   = "Date of application: 15-12-2019",
  year   = "2019",
}