 
          Notes
          (1) The scanned version of the Martynov (1973) paper (in Russian) is available here. 
          This paper is about when the exact mid-transit and mid-occultation occurs on an 
          eccentric orbit. Since the paper is hardly available, Dr. L. Szabados (Konkoly
          Observatory, Hungary) scanned it for me.
          
          Full reference: Martynov, D. Ya. 1973, in: V. P. Tsessevich (ed.), Eclisping Variable Stars, 
          IPST Astrophys. Libr., Jerusalem, p. 313
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