[http://www.stat.auckland.ac.nz/~paul/ItDT Introduction to Data Technologies] by Paul Murrell (2008). [http://www.stat.auckland.ac.nz/~paul/ItDT/itdt-2008-05-19.pdf Complete electronic draft].
[http://www.stat.auckland.ac.nz/~paul/ItDT Introduction to Data Technologies] by Paul Murrell (2008). [http://www.stat.auckland.ac.nz/~paul/ItDT/itdt-2008-05-19.pdf Complete electronic draft].