4Gordon S N.Software reused by specialization of generic procedures through views.IEEE Trans.on Software Engineering,1997,23 (7).
5Rao M,Pandey A,Ahuja A K,Ramamurthy V S,Kasturirangan K.National spatial data infrastructure-Coming together of GIS and EO in India.Acta Astronautica 51,Jul.-Nov.,2002,(1-9):527～535.
