31P, 13C and 17O nuclear magnetic relaxation in triphenylphosphine oxide (TPPO) and its complexes. II. Internal motions in TPPO and in the complex Zn (TPPO)4(BF4)2P Rubini, H El Alaoui and El AbdallaouiJ. Chim. Phys., 87 (1990) 355-365DOI: https://doi.org/10.1051/jcp/1990870355
