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1954 Science 24 Dec. 1078/2 (table) Proposed symbols for units..Atomic mass unit..amu..1 amu=931 Mev.

1988 H. A. Klein Sci. Measurem. xx. 207 The amu (physical) is 0.03 percent less than the amu (international).

2008 J. E. House Inorg. Chem. xiii. 423 Naturally occurring boron consists of approximately 20% of ¹⁰B and 80% of ¹¹B, leading to an average atomic mass of 10·8 amu.