Beer, P., Crowe, D., & Main, B. (1989). Ammonium redox-responsive receptors containing two or three ferrocene redox-active centres attached to di- and tri-aza crown ether macrocycles.

Beer, P., D. Crowe, and B. Main. Ammonium Redox-responsive Receptors Containing Two or Three Ferrocene Redox-active Centres Attached to Di- and Tri-aza Crown Ether Macrocycles. 1989.

Beer, P., et al. Ammonium Redox-responsive Receptors Containing Two or Three Ferrocene Redox-active Centres Attached to Di- and Tri-aza Crown Ether Macrocycles. 1989.