1. Siri, https://en.wikipedia.org/wiki/Siri . Accessed 20 April 2017
2. AlphaGo, https://deepmind.com/research/alphago/ . Accessed 20 April 2017
3. IBM Watson, https://www.ibm.com/watson/ . Accessed 20 April 2017
4. Microsoft Translator Speech API, https://www.microsoft.com/en-us/translator/speech.aspx . Accessed 20 April 2017
5. Amazon Prime Air, https://www.amazon.com/Amazon-Prime-Air/b?node=8037720011 . Accessed 20 April 2017