TR 101 053-4-1999 Security Algorithms Group of Experts (SAGE); Rules for the Management of the TETRA Standard Encryption Algorithms; Part 4: TEA4 (V1.1.1)
2006TR 101 053-4-2006 Security Algorithms Group of Experts (SAGE); Rules for the management of the TETRA standard encryption algorithms; Part 4: TEA4 (V1.1.2)
1999TR 101 053-4-1999 Security Algorithms Group of Experts (SAGE); Rules for the Management of the TETRA Standard Encryption Algorithms; Part 4: TEA4 (V1.1.1)