[1] T. Vicsek, A. Czir´ok, E. Ben-Jacob, I. Cohen, and O. Shochet, Phys. Rev. Lett. 75, 1226 (1995).
[2] T. Vicsek and A. Zafeiris, Phys. Rep. 517, 71 (2012).
[3] A. Sokolov, I. S. Aranson, J. O. Kessler, and R. E. Goldstein, Phys. Rev. Lett. 98, 158102 (2007).
[4] V. Schaller, C. Weber, C. Semmrich, E. Frey, and A. R. Bausch, Nature (London) 467, 73 (2010).
[5] Y. Katz, K. Tunstrøm, C. C. Ioannou, C. Huepe, and I. D. Couzin, Proc. Natl. Acad. Sci. U.S.A. 108, 18720 (2011).
[6] S. Thutupalli, R. Seemann, and S. Herminghaus, New J. Phys. 13, 073021 (2011).
[7] Y. Sumino, K. H. Nagai, Y. Shitaka, D. Tanaka, K. Yoshikawa, H. Chat´e, and K. Oiwa, Nature (London) 483, 448 (2012).
[8] T. Ohta, J. Phys. Soc. Jpn. 86, 072001 (2017).
[9] J. Toner and Y. Tu, Phys. Rev. Lett. 75, 4326 (1995).
[10] M. C. Marchetti, J. F. Joanny, S. Ramaswamy, T. B. Liverpool, J. Prost, M. Rao, and R. A. Simha, Rev. Mod. Phys. 85, 1143 (2013).
[11] G. Gr´egoire and H. Chat´e, Phys. Rev. Lett. 92, 025702 (2004).
[12] N. Shimoyama, K. Sugawara, T. Mizuguchi, Y. Hayakawa, and M. Sano, Phys. Rev. Lett. 76, 3870 (1996).
[13] H. Chat´e, F. Ginelli, G. Gr´egoire, F. Peruani, and F. Raynaud, Eur. Phys. J. B 64, 451 (2008).
[14] E. Bertin, M. Droz, and G. Gr´egoire, Phys. Rev. E 74, 022101 (2006).; J. Phys. A 42, 445001 (2009).
[15] S. Mishra, A. Baskaran, and M. C. Marchetti, Phys. Rev. E 81, 061916 (2010).
[16] A. Gopinath, M. F. Hagan, M. C. Marchetti, and A. Baskaran, Phys. Rev. E 85, 061903 (2012).
[17] T. Ihle, Phys. Rev. E 88, 040303(R) (2013).
[18] O. Thual and S. Fauve, J. Phys. (Paris) 49, 1829 (1988).
[19] H. Sakaguchi, Prog. Theor. Phys. 87, 1409 (1992).
[20] K. Krischer and A. Mikhailov, Phys. Rev. Lett. 73, 3165 (1994).
[21] O. Descalzi, J. Cisternas, D. Escaff, and H. R. Brand, Phys. Rev. Lett. 102, 188302 (2009).
[22] A. Bricard, J. B. Caussin, N. Desreumaux, O. Dauchot, and D. Bartolo, Nature (London) 503, 95 (2013).
[23] H. Kuwayama, and S. Ishida, Sci. Rep. 3, 2272 (2013).
[24] S. Yamanaka and T. Ohta, Phys. Rev. E 89, 012918 (2014).
[25] M. Hayakawa, T. Hiraiwa, Y. Wada, H. Kuwayama, and T. Shibata, eLife 9, e53609 (2020).
[26] T. Hiraiwa, Phys. Rev. Lett. 125, 268104 (2020).
[27] J. B. Caussin, A. Solon, A. Peshkov, H. Chat´e, T. Dauxois, J. Tailleur, V. Vitelli, and D. Bar- tolo, Phys. Rev. Lett. 112, 148102 (2014).
[28] Y. Kuramoto and D. Battogtokh, Nonlinear Phenomena in Complex Systems (Dordrecht, Neth.) 5, 380 (2002).
[29] Y. Kuramoto, Chemical Oscillation, Waves, and Turbulence (Springer-Verlag, Berlin, 1984).
[30] H. Sakaguchi, Phys. Rev. E 70, 022901 (2004).
[31] H. Sakaguchi and K. Ishibashi, J. Phys. Soc. Jpn. 86, 114003 (2017).
[32] H. Sakaguchi and K. Ishibashi, J. Phys. Soc. Jpn. 87, 064001 (2018).
[33] R. Hayakawa, K. Ito, Y. Kimura, and K. Okano, Introduction to the dynamics of non- equilibrium systems (Baifukan, Japan, 2006) [published in Japanese].
[34] A. P. Solon and J. Tailleur, Phys. Rev. Lett. 111, 078101 (2013).
[35] A. P. Solon and J. Tailleur, Phys. Rev. E 92, 042119 (2015).
[36] A. P. Solon, H. Chat´e, and J. Tailleur, Phys. Rev. Lett. 114, 068101 (2015).
[37] J. Tailleur and M. Cates, Phys. Rev. Lett. 100, 218103 (2008).
[38] M. Cates and J. Tailleur, Annu. Rev. Condens. Matter Phys. 6, 219 (2015).
[39] S. Chatterjee, M. Mangeat, R. Paul, and H. Rieger, Europhys. Lett. 130, 66001 (2020).
[40] M. Mangeat, S. Chatterjee, R. Paul, and H. Rieger, Phys. Rev. E 102, 042601 (2020).
[41] M. Ballerini, N. Cabibbo, R. Candelier, A. Cavagna, E. Cisbani, I. Giardina, A. Orlandi, G. Parigi, A. Procaccini, M. Voale, and V. Zdravkovic, Anim. Behav. 76, 201 (2008).
[42] H. Ebata and M. Sano, Sci. Rep. 5, 8546 (2015).
[43] M. Tamara and T. Ohta, Europhys. Lett. 114, 30002 (2016).
[44] S. Tanaka, S. Nakata, and M. Nagayama, Soft Matter 17, 388 (2021).
[45] H. Sakaguchi and K. Ishibashi, Phys. Rev. E 100, 052113 (2019).
[46] S. Galam, Physica A 238, 66 (1997).
[47] S. Galam, Physica A 274, 132 (1999).
[48] R. Hegselmann, and U. Krause, J. Artif. Soc. Soc. Simul. 5, 3, 2 (2002).
[49] M. Tiwari, X. Yang, and S. Sen, Physica A 582, 126287 (2021).
[50] D. Str¨ombom, T. Hassan, W. H. Greis and A. Antia, R. Soc. open sci. 6, 190381 (2019).
[51] N. Fat`es, J. Cellular Automata, 9, 5–6, 387–416 (2014).