[2] Morris, J.F. (1974) High efficiency, low temperature cesium diodes with lanthanum hexaboride electrodes, NASA TMX-71549, IEEE International Conference on Plasma Science, Conference Record Abstracts, pp. 7-8. [3] Johnson, R.W. & Danne, A.H. (1961) The lanthanum-boron system, Journal of Physical Chemistry, 65, pp. 909-915. [4] Lundholm, J.G., Morris, J.F. & Searns, J.W. (1975) NASA thermionic converter research and technology program, IEEE Thermionic Conversion Specialist Conference, Eindhoven, The Netherlands. [5] Pawlik, E.V. & Phillips, W.M. (1977) A nuclear electric propulsion vehicle for planetary exploration, Journal of Spacecraft and Rockets, 14, pp. 518-525. [6] Morris, J.F. (1977) High temperature, high power density thermionic energy conversion for space, NASA TMX-73844. [7] Morris, J.F. (1972) The diminiode: a research and development tool for nuclear thermionics, NASA TMX-2586. [8] Morris, J.F. (1971) Vacuum-packaged cesium for nuclear thermionic diodes, NASA TMX-2152. [9] Lancashire, R.B., Manista, E.J., Morris, J.F. & Smith, A.L. (1972) Emitter surface temperature distribution for a miniature thermionic diode, NASA TMX- 2588. [10] Morris, J.F. (1970) A freeze-melt valve and dispensing system for cesium, NASA TMX-2126. [11] Smith, A.L., Manista, E.J. & Morris, J.F. (1974) Thermionic performance of a cesium diminiode with relatively impure 110-tungsten electrodes, NASA TMX- 3021.
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