Spiess, Hans W. Emeritus Group Spiess: Polymer Spectroscopy, MPI for Polymer Research, Max Planck Society;
http://aip.scitation.org/doi/pdf/10.1063/1.1681670 (Any fulltext)
http://dx.doi.org/10.1063/1.1681670 (Any fulltext)
Mahnke, H., Sheline, R. K., & Spiess, H. W. (1974). Analysis of the 13C chemical shift tensor in CO, Ni(CO)4, and Fe(CO)5 and its relationship to π‐back bonding. The Journal of Chemical Physics, 61(1), 55-60. doi:10.1063/1.1681670.