Спостерігачі

• 

  Rigoberto Liston

  https://inventmag.com/%ED%95%98%EC%9D%B4%EC%9B%90%EC%8A%AC%EB%A1%AF-vip%ED%94%84%EB%A1%9C%EA%B7%B8%EB%9E%A8-%EC%B5%9C%EA%B3%A0%EC%9D%98-%EC%B9%B4%EC%A7%80%EB%85%B8-%EA%B2%BD%ED%97%98%EC%9D%84-%EC%9C%84%ED%95%9C-%EC%A7%80/