Sulimon Sattari, Udoy Basak, Sky Nicholson, Jason Green, Mikito Toda, Tamiki Komatsuzaki: “A sandbox model system for analyzing leadership in collective motion”, The 20th RIES-HOKUDAI International Symposium(12.2-12.3 ,2019), Hokkaido University, Sapporo, Japan 12, 2 (Poster)