@manual{Bydałek:1975,
  author = "A. Bydałek and F. Romankiewicz and J. Romer and E. Tomasik",
  title  = "Method of regeneration of solder, particularly of tin-lead solders and an apparatus for application the method, Patent #: 3897336",
  note   = "Date of application: 11-01-1974, Date of acceptance: 29-07-1975",
  year   = "1975",
}