http://www.callery.com/pdf/bulletin/calselect_stab.pdf (http://www.callery.com/pdf/bulletin/calselect_stab.pdf)
https://www.thevespiary.org/rhodium/Rhodium/pdf/sodium.triacetoxyborohydride.pdf (https://www.thevespiary.org/rhodium/Rhodium/pdf/sodium.triacetoxyborohydride.pdf)