www.slideshare.net/natasaljubicklemse/qr-codes-online-event-2822018
The 11 Best QR Code Reader Apps for Android, iPhone, Windows Phone & BlackBerry (2016) https://uqr.me/blog/best-qr-code-readers/
40 Interesting Ways to use QR Codes in the Classroom http://bit.ly/usingqrcodes40
www.vagabondages.org/post/2011/02/22/40-fa%C3%A7on-d-utiliser-les-QRcodes-en-classe
How to create QR code for audio file using google drive and https://qrcode.kaywa.com/
https://thepegeek.com/2016/08/make-qr-code-treasure-hunt/