Kaloshin, V., ZHANG, K., &; ZHENG, Y. (2010). Almost dense orbit on energy surface. In XVIth International Congress on Mathematical Physics (pp. 314–322). Prague, Czech Republic: World Scientific.https://doi.org/10.1142/9789814304634_0017 
LibreCat: https://research-explorer.ista.ac.at/record/8507
DOI: 10.1142/9789814304634_0017