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ACKNOWLEDGEMENTS 
  
The authors like to thank 
cooperation 
REFERENCES 
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Clerici Zz. 
Feller,W. 
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Kubik,K. 
Kubik,K. 
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25 - 
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Bulletin Géodésique 95 (1970)1,p 21-40. 
Ihe effects of systematic image errors 
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