G.-C. Guo, Q.-G. Wang, G.-D. Zhou, T. C. W. Mak (1998). «Synthesis and characterization of Ag2C2·2AgClO4·2H2O: a novel layer-type structure with the acetylide dianion functioning in a 6-η1,η1:η2,η2:η2,η2 bonding mode inside an octahedral silver cage». Chem. Commun.: 339-340. doi:10.1039/a708439k.