Zimmermann, Herbert Department of Molecular Physics, Max Planck Institute for Medical Research, Max Planck Society; Department of Biomolecular Mechanisms, Max Planck Institute for Medical Research, Max Planck Society;
http://www.tandfonline.com/doi/abs/10.1080/02678299208030395#aHR0cDovL3d3dy50YW5kZm9ubGluZS5jb20vZG9pL3BkZi8xMC4xMDgwLzAyNjc4Mjk5MjA4MDMwMzk1QEBAMA== (beliebiger Volltext)
https://dx.doi.org/10.1080/02678299208030395 (beliebiger Volltext)
Zimmermann, H., Billard, J., Gutman, H., Wachtel, E. J., Poupko, R., & Luz, Z. (1992). Thermotropic liquid crystals derived from benzopyranobenzopyran-dione. Preparation and physical characterization. Liquid Crystals, 12(2), 245-262. doi:10.1080/02678299208030395.