Zimmermann, H. Department of Molecular Physics, Max Planck Institute for Medical Research, Max Planck Society;
https://www.tandfonline.com/doi/abs/10.1080/00268978700100151?needAccess=true#aHR0cHM6Ly93d3cudGFuZGZvbmxpbmUuY29tL2RvaS9wZGYvMTAuMTA4MC8wMDI2ODk3ODcwMDEwMDE1MT9uZWVkQWNjZXNzPXRydWVAQEAw (Any fulltext)
https://doi.org/10.1080/00268978700100151 (Any fulltext)
Gochin, M., Hugi-Cleary, D., Zimmermann, H., & Pines, A. (1987). Two-dimensional multiple quantum N.M.R. of isotopic mixtures in liquid crystals. Molecular Physics, 60(1), 205-212. doi:10.1080/00268978700100151.