Thomas Jagau, Johannes Gutenberg-Unversity, Mainz, Germany Journal of Unsolved Questions, 1, 1, Open Questions, 4-7, 2011 (Received December 27th 2010, published online December 28th 2010) Among the most interesting problems in state-of-the-art theoretical chemistry ranks the question: How can electronic states with multireference character be efficiently treated with chemical accuracy? Multireference problems include bond-breaking processes, … Continue reading What is the best multireference coupled-cluster method?