Giusca, C; Severn, I; Greenwood, J C (2007) The effect of hydraulic fluids on pressure balances. NPL Report. DEPC-EM 009

Severn, I (2004) The assignment of uncertainties to mass standards at NPL. NPL Report. MATC(A)166

Bayliss, D J; Severn, I (2002) The traceability of density measurements via solid density reference standards using the NPL 1 kg hydrostatic weighing apparatus. NPL Report. CMAM 66

Severn, I (2000) A collaboration between ten national measurement institutes to measure the mass of two one kilogram mass standards. NPL Report. CMAM 36

Severn, I; Raymond, N M (1996) The assignment of values to NPL's 1 kg standards following the third periodic verification of prototype kilograms. NPL Report. MOT 2