@incollection{MEM_2021_50_a9,
     author = {Hakkaev, Sevdzhan},
     title = {Hamilton's instability index and applications to periodic waves},
     booktitle = {},
     series = {Mathematics and Education in Mathematics},
     pages = {102--110},
     year = {2021},
     volume = {50},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MEM_2021_50_a9/}
}