Measuring the Expressiveness of a Constrained Natural Language: An Empirical Study. - Stephen Boyd 001; Didar Zowghi; Alia Farroukh (RE, 2005)

Optimal-Constraint Lexicons for Requirements Specifications. - Stephen Boyd 001; Didar Zowghi; Vincenzo Gervasi (REFSQ, 2007)

Design and evaluation of a method to reduce the lexical ambiguity of requirement specifications - Stephen Boyd 001 (2009)