You're looking for information on Leo Brouwer's "Paisaje Cubano con Lluvia" and its relation to a PDF document. Here's what I found:
If you have printed the PDF and find yourself stuck at measure 13, you are not alone. Here is a three-step method to conquer this bar: leo brouwer paisaje cubano con lluvia pdf 13
If you are playing measure 13 without feeling that rhythmic tug-of-war, you are playing notes, not music. Listen to Brouwer’s own recording (available on YouTube or Spotify). At the 0:45 to 0:50 timestamp, you will hear measure 13: the guitar suddenly sounds like a tres (Cuban guitar) lost in a hurricane. You're looking for information on Leo Brouwer's "Paisaje
Notable Features:
Sheet Music Retailers: Standard notation for the quartet is available at Guitarras de Luthier . Listen to Brouwer’s own recording (available on YouTube