New approaches to two group diffusion calculations for heterogeneous lattices /
Hartnell-Beavis, M. C.,author.
Hicks, D.,author.
Atomic Energy Research Establishment (Harwell, England),issuing body.
Great Britain.Her Majesty's Stationery Office.
"Aug., 1957."
Sold but not published by H.M. Stationery Office.