by Wiatrowski, W A, Giles, E R, Cooke, E P
Published in Health physics (1958) (01.01.1996)

by Chraplyvy, A.R., Gnauck, A.H., Tkach, R.W., Derosier, R.M., Giles, E.R., Nyman, B.M., Ferguson, G.A., Sulhoff, J.W., Zyskind, J.L.
Published in IEEE photonics technology letters (01.01.1995)