REFERENCIAS'2

1.- https://www.google.com.mx/imgres?imgurl=http%3A%2F%2Fattach.bbs.miui.com%2Fforum%2F201109%2F21%2F170656rh511xzxzrir7vfq.jpg&imgrefurl=http%3A%2F%2Fwww.miui.com%2Fthread-262455-1-1.html&docid=D6aUNwI5Ykv64M&tbnid=ILziCWf-TOjooM%3A&vet=10ahUKEwi41N2juPjWAhWLx4MKHVolCpkQMwgmKAAwAA..i&w=2560&h=1600&bih=974&biw=1920&q=celeste%20vintage&ved=0ahUKEwi41N2juPjWAhWLx4MKHVolCpkQMwgmKAAwAA&iact=mrc&uact=8   

2.- https://www.google.com.mx/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&ved=0ahUKEwiyv7TUu_jWAhVhyFQKHRwwBn8QjRwIBw&url=http%3A%2F%2Fdocplayer.hu%2F8459911-Temakorok-osi-rns-vilag-bevezetes-rns-ek-tradicionalis-szerepben.html&psig=AOvVaw1yZ-UmX8hn8fGvfoqxEV2Z&ust=1508357469200653