The 11th String Quartet was written in 1947, and dedicated to Mindinha.
Movements:
String Quartet
Published by Southern Music Publishers, New York.
Villa-Lobos, Heitor. 1966. String quartet no. 11: for 2 violins, viola and 'cello. New York [etc.]: Southern Music Pub. [etc.].
You can listen to the Bessler-Reis Quartet playing Quartets 7 & 11, streamed on the Internet on this page of the Radio UOL website.
Premiere performance by the Quarteto Iacovino in Rio in 1953.
There are two records in the Villa-Lobos Concerts database for this String Quartet as of August 2009.