AM_Hydrogen_21 Formula: H Name: Hydrogen Unit cell: 3.659 3.659 5.975 90.0 90.0 120.0 , V=69.28 Space group: P63/MMC (194)

Ishmaev S N , Sadikov I P , Chernyshev A A , Vindryevsky B A , Sukhoparov V A , Telepnev A S , Kobelyev G V , Zhurnal Eksperimental noi i Teoreticheskoi Fiziki , 84 (1983) p.394-403, Neutron structural investigations of solid para-hydrogen at pressures, up to 24 kbar, Locality: synthetic, Sample: at P = .0252 GPa & T = 8.5 K, Note: known as para-hydrogen