Robuta

https://www.scielo.org.za/scielo.php?script=sci_arttext&pid=S0038-23532020000400002&lng=es&nrm=iso

https://www.expats.cz/czech-news/author/william-nattrass-wphad/5

https://www.adelaide.edu.au/directory/org/8099.html?dsn=directory.phonebook;id=179;m=view

https://www.westnattrass.com/

https://www.adelaide.edu.au/directory/org/International%20Recruitment%20and%20Admission%20Services.html?dsn=directory.phonebook;id=179;m=view

https://www.adelaide.edu.au/directory/building/17389.html?dsn=directory.phonebook;id=179;m=view