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      The alternating path problem revisited 

      Claverol Aguas, Mercè; Garijo Royo, Delia; Hurtado Díaz, Ferran; Lara Cuevas, María Dolores; Seara Ojea, Carlos (2013)
      It is well known that, given n red points and n blue points on a circle, it is not always possible to find a plane geometric ...