@misc{okamoto_farinfrared_spectrum_1991, 
author={Okamoto, H.,Mukai, T.},
title={Far-infrared spectrum of irregularly shaped particles},
year={1991},
howpublished = {conference paper,conference lecture: null; 1991},
note = {Online available at: \url{} (DOI). Okamoto, H.; Mukai, T.: Far-infrared spectrum of irregularly shaped particles. In: Proceedings of the XIIIth Grain Formation Work shop. 1991. 13-18.}}