Links:

• specification: https://blogs.msdn.microsoft.com/chrisrae/2010/09/25/where-is-the-documentation-for-offices-docxxlsxpptx-formats-part-1-office-2007/

cells and rows

• https://stackoverflow.com/questions/18334314/what-do-excel-xml-cell-attribute-values-mean/18346273#18346273
• row class
• cell class

Shared strings

• http://ericwhite.com/blog/advice-when-generating-spreadsheets-use-inline-strings-not-shared-strings/
• https://msdn.microsoft.com/en-us/library/office/gg278314.aspx

Worksheets

• https://msdn.microsoft.com/en-us/library/office/gg278320.aspx
• https://msdn.microsoft.com/en-us/library/office/gg278309.aspx

Package structure

• http://officeopenxml.com/anatomyofOOXML-xlsx.php

Used libraries

spreadseet/log.lua: https://github.com/rxi/log.lua