* The structures of the highlevel API use references to this to perform most of their
* operations. Its probably unwise to use these low level structures directly unless you
* really know what you're doing. I recommend you read the Microsoft Excel 97 Developer's
- * Kit (Microsoft Press) and the documentation at http://sc.openoffice.org/excelfileformat.pdf
+ * Kit (Microsoft Press) and the documentation at https://sc.openoffice.org/excelfileformat.pdf
* before even attempting to use this.
*
* @see InternalWorkbook
* The structures of the highlevel API use references to this to perform most of their
* operations. Its probably unwise to use these low level structures directly unless you
* really know what you're doing. I recommend you read the Microsoft Excel 97 Developer's
- * Kit (Microsoft Press) and the documentation at http://sc.openoffice.org/excelfileformat.pdf
+ * Kit (Microsoft Press) and the documentation at https://sc.openoffice.org/excelfileformat.pdf
* before even attempting to use this.
*
* @see HSSFWorkbook
* The chart record is used to define the location and size of a chart.<p>
*
* Chart related records don't seem to be covered in either the
- * <A HREF="http://sc.openoffice.org/excelfileformat.pdf">OOO</A>
+ * <A HREF="https://sc.openoffice.org/excelfileformat.pdf">OOO</A>
* or the
* <A HREF="http://download.microsoft.com/download/0/B/E/0BE8BDD7-E5E8-422A-ABFD-4342ED7AD886/Excel97-2007BinaryFileFormat(xls)Specification.pdf">MS</A>
* documentation.