@misc{schultheiss_development_of_1990, 
author={Schultheiss, G. F.},
title={Development of underwater robots},
year={1990},
howpublished = {conference lecture: Rio de Janeiro (BR); 20.03.1990},
note = {Online available at: \url{} (DOI). Schultheiss, G.: Development of underwater robots. Seminar of the Robot-Laboratory, PETROBRÁS Research Center CENPES. Rio de Janeiro (BR), 1990.}}