1. Thermionic Properties of Some Refractory Metal Carbides
2. Certain Refractory Compounds as Thermionic Emitters
3. Materials Problems in Cesium Thermionic Converters
4. 4J. A. Coffman, K. L. Coulson, and G. M. Kibler , "Carboniza tion of Plastics and Refractory Materials Research Program "; pp.13 -24 , General Electric Co., Report No. NP-10151; Quart erly Progress Rept. No. 5, Contract AF33(616)-6841, 13 pp., 1961 .
5. 5J. A. Coffman, G. M. Kibler, T. R. Riethof, and A. A. Watts , "Carbonization of Plastics and Refractory Materials Research "; pp.23 -58 , Report No. WADD-TR-60-646 (Pt. I), Contract AF33(616)-6841, 1961 .