Gunn, D; Walker, K (1999) Intercomparison of force standards between NPL, NIM and SCL. NPL Report. CMAM 33
Salgado, J; Duta, A; Lewis, A; Gunn, D; Picotto, G B; Borovsky, J; Nanits, M M; Mudronja, V; Castellanos, C C; Kornbilt, F; Renegar, B; de Souza, M M (2017) Calibration of surface roughness standards. Metrologia, 54 (1A). 04005 ISSN 0026-1394