1. US 9.234.151 (2016 ExxonMobil); US 9.090.527 (2015 Sumitomo); US 8.921.251 (2014); US 5.968.866 (1999 BP); US 6.900.152 (2005 Tosoh); US 6.459.007 (2002 Enichem); Steinborn Chapter8;
2. Polycyclotrimerization as a general route to polymers with rings in the chains