Software inspection, Tom Gilb and Dorothy Graham, Addison Wesley, 1993 ISBN 0-20163181-4 Price £24.95 (paperback). - John Ashley (J. Softw. Maintenance Res. Pract., 1995)

Model and observation of the impact of JTIDS/MIDS on GNSS $C/N_{0}$ degradation. - Axel Garcia Pena; Christophe Macabiau; John Ashley; Dmitri Baraban; Pierre Durel; Mikael Mabilleau (PLANS, 2020)