Observadores

• 

  Chandra Neild

  https://www.alg-consultant.com/%EC%8B%A0%EC%86%8D-%EB%B9%84%EC%83%81%EA%B8%88%EB%8C%80%EC%B6%9C-%EC%B6%94%EC%B2%9C-%EA%B2%BD%EC%A0%9C%EC%A0%81-%EC%9C%84%EA%B8%B0%EC%97%90%EC%84%9C-%EB%8B%B9%EC%8B%A0%EC%9D%84-%EC%A7%80%EC%BC%9C/