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

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

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

[4] S2 Geometry (2018-03-07 06:20:35 +09:00) http://s2geometry.io/

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

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

[7] 【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 (2018-03-19 15:51:52 +09:00) http://pokemongo-news.com/archives/164725