@manual{Bydałek:1979,
  author = "A. Bydałek and F. Romankiewicz and J. Romer and E. Tomasik",
  title  = "A method of regeneration of solders, particularly of tin-lead solders, and an apparatus for application of invented method, Patent #: 947352",
  note   = "Date of application: 20-04-1979",
  year   = "1979",
}