Observadores

• 

  Nestor Baer

  https://woriline.com/%EC%86%8C%EC%95%A1%EB%8C%80%EC%B6%9C-%EC%A1%B0%EA%B1%B4-%EC%89%AC%EC%9B%80-%EB%8B%B9%EC%8B%A0%EC%9D%B4-%EC%95%8C%EC%95%84%EC%95%BC-%ED%95%A0-%EB%AA%A8%EB%93%A0-%EA%B2%83/