Zhengtian Ai PhD candidate / guest Name Z. Ai Telephone +31 71 527 7058 E-mail z.ai@liacs.leidenuniv.nl PhD candidate / guest Science Leiden Inst of Advanced Computer Science Work address Snellius Niels Bohrweg 1 2333 CA Leiden Contact +31 71 527 7058 z.ai@liacs.leidenuniv.nl Publications