J. C. Howard, J. L. Gray, A. J. Hardwick, L. T. Nguyen, G. S. Tschumper, J. Chem. Theory Comput. 2014, 10, 12, 5426–5435; https://doi.org/10.1021/ct500860v
The first HF dimer in this paper's supplemental section was used in '/geometries/HF_clusters'
B. Baburao, D. P. Visco, T. V. Albu, J. Phys. Chem. A 2007, 111, 32, 7940–7956; https://doi.org/10.1021/jp0727648
Tetramer through octamer was obtained from this work. These geometries are all cyclic.