M. S.  Balakrishna, Kumar, P., Punji, B., and Mague, J. T., ?Large-bite bisphosphite, 1,3-C6H4OPOC10H6(?-S)C10H6O2: synthesis, copper(I), and gold(I) complexes?, Journal of Organometallic Chemistry, vol. 695, no. 7, pp. 981?986, 2010.