S A Adonin, M N Sokolov, V P Fedin, Polynuclear halide complexes of Bi(III): From structural diversity to the new properties, Coord Chem Rev 312, 1 (2016)
P Schwerdffeger, P D W Boyd, T Fischer, P Hunt, M Liddell, Trends in inversion barriers of group 15 compounds. 2. Ab-initio and density functional calculations on group 15, JACS 116, 9620 (1994)
H Bettinger, P Schleyer, H Schaefer, NF5 - Viable or Not?, JACS 120, 11439 (1998)