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  Online resource available at: Springer Nature - Springer Journals Archive Collection
• Available from 03/01/1936 volume: 1 issue: 1 until 12/31/1996 volume: 61 issue: 4.
  
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  Online resource available at: Springer Nature - Complete Springer Journals
• Available from 03/01/1936 volume: 1 issue: 1 until 12/31/2024 volume: 89 issue: 4.
  

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