@manual{Romankiewicz:1976,
  author = "F. Romankiewicz",
  title  = "A method of regeneration of solders, particularly of tin-lead solders, and an apparatus for application of invented method, Patent #: 1415621",
  note   = "Date of application: 11-01-1974, Date of acceptance: 24-03-1976",
  year   = "1976",
}