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Stanford Exploration Project, Department of Geophysics, Stanford University, Stanford, California 94305, USA 
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ChevronTexaco Exploration and Production Technology Company, 6001 Bollinger Canyon Road, San Ramon, California 94583-2324 
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... unknown
Mitášová and Mitáš (1993) derive an analytical Green's function for a different model of tension splines using special functions. 
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