@manual{Gąsiorek:2000,
author
=
"M.Gąsiorek and S.Jerzyniak",
title
=
"Sposób wytwarzania materiałów elektretowo-piezoelektrycznych, Patent #:178558",
note
=
"Date of application: 09-06-1997, Date of acceptance: 31-05-2000",
year
=
"2000",
}