The subgraph homeomorphism problem on reducible flow graphs. - T. Hirata; M. Kimura (Graph Theory and Algorithms, 1980)

Global map of water vapor content from ADEOS/POLDER and NASA/AERONET. - Sonoyo Mukai; Itaru Sano; T. Hirata; Brent N. Holben (IGARSS, 2002)