1. Embedded Computing Lab Federal University of Santa Catarina "Ophidian: an open source library for physical design research and teaching". https://github.com/eclufsc/ophidian. Embedded Computing Lab Federal University of Santa Catarina "Ophidian: an open source library for physical design research and teaching". https://github.com/eclufsc/ophidian.
2. Silicon integration initiative "open access". http://www.si2.org/openaccess/. Silicon integration initiative "open access". http://www.si2.org/openaccess/.
3. University of michigan "umich physical design tools". http://vlsicad.eecs.umich.edu/BK/PDtools/. University of michigan "umich physical design tools". http://vlsicad.eecs.umich.edu/BK/PDtools/.