You may also wish to search for items by Lorbeer.
Only one matching reference was found.
Mayr, M.; Lorbeer, E.; Kratzl, K., Gas chromatographic separation of diterpene acids on glass capillary columns of different polarity, J. Amer. Oil Chem. Soc., 1982, 59, 1, 52-57, https://doi.org/10.1007/BF02670069 . [all data]