Liu, K., H. Wang, F. Han, and H. Zhang. “Visual Place Recognition via Robust ℓ2-Norm Distance Based Holism and Landmark Integration”. Proceedings of the AAAI Conference on Artificial Intelligence, vol. 33, no. 01, July 2019, pp. 8034-41, doi:10.1609/aaai.v33i01.33018034.