Shameless plug of my Go R-tree implementation, which cites the Guttman R-tree paper and the Roussopoulos/Kelley/Vincent nearest-neighbor search paper in its imp

Shameless plug of my Go R-tree implementation, which cites the Guttman R-tree paper and the Roussopoulos/Kelley/Vincent nearest-neighbor search paper in its implementation, and is therefore perhaps a useful resource: https://github.com/dhconnelly/rtreego https://github.com/dhconnelly/rtreego