Extrachromosomal circular copies of an 'inter-Alu' unstable sequence in human DNA are amplified during in vitro and in vivo ageing.
Shmookler Reis RJ, Lumpkin CK, McGill JR, Riabowol KT, Goldstein S. Extrachromosomal circular copies of an 'inter-Alu' unstable sequence in human DNA are amplified during in vitro and in vivo ageing. Nature. 1983 Feb 03; 301(5899):394-8.