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2. G.I. Parkin and G. O'Neill. Specification of the MAA Standard in VDM. NPL Report DITC 160/90. February 1990.
3. BS 7101:1989, ISO 8730:1986. Protecting authentic wholesale messages between financial institutions. Obtainable from: Sales Department, BSI, Linford Wood, Milton Keynes, MK14 6LE.
4. D.W. Davies and D.O. Clayden. The Message Authenticator Algorithm (MAA) and its Implementation. NPL Report DITC 109/88. February 1988.
5. C.B. Jones. Systematic Software Development Using VDM. Prentice-Hall International, 1986.