[1] [CITE@en[S2 Cells: A Foundation of Pokemon GO Design | Pokemon GO GamePress]]
([TIME[2018-03-19 15:23:46 +09:00]])
<https://pokemongo.gamepress.gg/s2-cells-foundation-pokemon-go-design>

[2] [CITE@en-US[S2 cells and Pokémon GO | Pokemon GO Hub]]
([[Zeroghan]]著, [TIME[2018-03-18 17:15:34 +09:00]])
<https://pokemongohub.net/post/wiki/s2-cells-pokemon-go/>

[3] [CITE@en-US[S2 cells and Pokémon GO | Pokemon GO Hub]]
([[Zeroghan]]著, [TIME[2018-03-18 17:15:34 +09:00]])
<https://pokemongohub.net/post/wiki/s2-cells-pokemon-go/>

[4] [CITE@en[S2 Geometry]]
([TIME[2018-03-07 06:20:35 +09:00]])
<http://s2geometry.io/>

[5] [CITE@en[google/s2geometry: Computational geometry and spatial indexing on the sphere]]
([TIME[2018-03-19 15:51:18 +09:00]])
<https://github.com/google/s2geometry>

[6] [CITE@ja[ポケモンGO用のS2セルビューワーを公開しました - Togetter]]
([TIME[2018-03-19 15:51:42 +09:00]])
<https://togetter.com/li/1198900>

[7] [CITE@ja[【ポケモンGO】EXレイドの開催地区が検索可能に!?話題のS2セルとは?【ミュウツー】 | ポケモンGO攻略ニュース]]
([TIME[2018-03-19 15:51:52 +09:00]])
<http://pokemongo-news.com/archives/164725>