: "Hierarchical nanostructures by nanotube grafting on porous microcellular substrates" , published in Journal of Physics D: Applied Physics (2009). Other References
The number most likely refers to one of the following specific technical papers or products: Scientific and Technical Papers 195503
: "The electronic structure and optical response of rutile, anatase and brookite TiO2" , published in Journal of Physics: Condensed Matter (2012). anatase and brookite TiO2"