Robust watermarking of vector digital maps. - Ryutarou Ohbuchi; Hiroo Ueda; Shuh Endoh (ICME (1), 2002)

Watermarking 2D Vector Maps in the Mesh-Spectral Domain. - Ryutarou Ohbuchi; Hiroo Ueda; Shuh Endoh (Shape Modeling International, 2003)