Aprahamian I, Eisenberg D, Hoffman RE, Sternfeld T, Matsuo Y, Jackson EA, Nakamura E, Scott LT, Sheradsky T, Rabinovitz M. Ball-and-socket stacking of supercharged geodesic polyarenes: bonding by interstitial lithium ions. J Am Chem Soc. 2005 Jul 06;127(26):9581–7. doi: 10.1021/ja0515102. PMID: 15984885.