^van der Woerd MJ, Pelletier JJ, Xu S, Friedman AM. Restriction enzyme BsoBI-DNA complex: a tunnel for recognition of degenerate DNA sequences and potential histidine catalysis. Structure. February 2001, 9 (2): 133–44. PMID 11250198. doi:10.1016/S0969-2126(01)00564-0.