States7113388 United States patent 7113388, Mussig & Hans-Joachim, "Semiconductor capacitor with praseodymium oxide as dielectric", diterbitkan tanggal 2003-11-06, dikeluarkan tanggal 2004-10-18, diberikan kepada IHP GmbH- Innovations for High Performance Microelectronics/Institute Fur Innovative Mikroelektronik