Jd. Fisher et al., SYNTHESIS AND STRUCTURAL CHARACTERIZATION OF DICYCLOPENTADIENYLALUMINUM ALKYL AND TRICYCLOPENTADIENYLALUMINUM COMPOUNDS - CRYSTAL-STRUCTUREOF A BIS(ETA(2)-CYCLOPENTADIENYL)ALUMINUM ALKYL COMPOUND (VOL 13, PG 3328, 1994), Organometallics, 14(8), 1995, pp. 4030-4030