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There are 40 versions of the QR Code. Details of these are explained here.
On Double-Sided QR-Codes
Table 1 from Enhancing the Data Storage Capacity in QR Code Using Compression Algorithm and Achieving Security and Further Data Storage Capacity Improvement Using Multiplexing
How do QR codes encode information? - Quora
Figure 6 from QR-code generator
QR code
AI-driven artistic QR code generation went virus in China and overseas - PingWest
To increase data capacity of QR code using multiplexing with color coding: An example of embedding speech signal in QR code
The Introduction to Quick Response (QR) Code, by JIN
What is a QR Code?