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    Swanepoel, Konrad  ORCID: 0000-0002-1668-887X and Valtr, P. 
  
(2004)
The unit distance problem on spheres.
    
      In: Pach, János, (ed.)
      Towards a Theory of Geometric Graphs.
    
      Contemporary mathematics (342).
    
    American Mathematical Society, Budapest, Hungary, pp. 273-280.
     ISBN 9780821834848
ORCID: 0000-0002-1668-887X and Valtr, P. 
  
(2004)
The unit distance problem on spheres.
    
      In: Pach, János, (ed.)
      Towards a Theory of Geometric Graphs.
    
      Contemporary mathematics (342).
    
    American Mathematical Society, Budapest, Hungary, pp. 273-280.
     ISBN 9780821834848