1. M. Ntemi, C. Kotropoulos and  E. Gionanidis, A weighted ordered probit Collaborative Kalman filter for hotel rating prediction, in Proc.  IEEE Int. Workshop on Machine Learning for Signal Processing (MLSP), Pittsburgh, PA, USA, 2019
  2. G. KarantaidisI. Sarridis and C. KotropoulosBlock Randomized Optimization for Adaptive Hypergraph Learningin Proc. IEEE Int. Conf. Image Processing (ICIP), Taipei, Taiwan, September 22-25, 2019.
  3. M. Ntemi and C. Kotropoulos, A Dyadic Particle Filter for Price Prediction”, in Proc. 27th European Signal Proc.  Conf. (EUSIPCO), A Coruna, Spain, September 2-6, 2019.
  4.  I. Sarridis and C. Kotropoulos, “Tourism recommendation driven by hypergraph learning”, Int. Conf. Acoustics, Speech and Signal Proc. (ICASSP 2019), Brighton, UK, Show and Tell.
  5. M. Ntemi and C. Kotropoulos, “A dynamic dyadic particle filter for price prediction“, Signal Processing 167 (2020): 107334, doi: