Bibliography (4):

1. https://ai.meta.com/blog/wav2vec-unsupervised-speech-recognition-without-supervision/

2. https://catalog.ldc.upenn.edu/LDC93S1

3. https://danielpovey.com/files/2015_icassp_librispeech.pdf

4. Wikipedia Bibliography:

   1. https://en.wikipedia.org/wiki/Phoneme  :

      https://en.wikipedia.org/wiki/Phoneme