I'm sorry for this question that might not fit in here however, I would like to give it a shot. I've chosen this stack since the question is somehow related to mobile robots. I've came across a paper in Mobile Robot Localization that has cited the following reference,
C. Brown, H. Durrant-Whyte, J. Leonard, B. Rao, and B. Steer. Kalman filter algorithms, applications, and utilities. Technical Report OUEL-1765/89, Oxford U. Robotics Research Group, 1989.
I couldn't find this reference. Nothing show up in Google not even in Google Scholar. In my university which allows me to access to a massive database, also nothing show up. Since this is a technical report, I'm interested to read it to have more appreciation about Kalman Filter. Has anyone came across this reference?