Schürmann, Dominik; Dechand, Sergej; Lars, Wolf (2017). "OpenKeychain: An Architecture for Cryptography with Smart Cards and NFC Rings on Android". Proc. ACM Interact. Mob. Wearable Ubiquitous Technol. 1 (3): 99:1–99:24. doi:10.1145/3130964. S2CID212416148.
Schürmann, Dominik; Dechand, Sergej; Lars, Wolf (2017). "OpenKeychain: An Architecture for Cryptography with Smart Cards and NFC Rings on Android". Proc. ACM Interact. Mob. Wearable Ubiquitous Technol. 1 (3): 99:1–99:24. doi:10.1145/3130964. S2CID212416148.