Upper and lower bounds for critical laplacian and critical size of some finite elliptical cylinders /
Ackroyd, R. T.,author.
Ball, J. M.,author.
Atomic Energy Research Establishment (Harwell, England),issuing body.
Great Britain.Her Majesty's Stationery Office.
"September 1957."
Sold but not published by H.M. Stationery Office.