Specification and implementation of directional operators in a 3D spatial query language for building information models

2009 ◽  
Vol 23 (1) ◽  
pp. 32-44 ◽  
Author(s):  
André Borrmann ◽  
Ernst Rank
Author(s):  
Behnam Atazadeh ◽  
Leila Halalkhor Mirkalaei ◽  
Hamed Olfat ◽  
Abbas Rajabifard ◽  
Davood Shojaei

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