High Efficiency RF Power Amplifiers by Raab -- Ham Radio, Oct. 1974, pp8-29.
Class E Switching Mode RF Power Amplifiers by Sokal -- RF Design, Summer 1980, pp33-39.
A 60-Watt PEP Linear Amplifier by Cracovski -- RF Design, Feb. 1988. [MRF128's @ 28V]
100 to 1000 MHz Computer-Controlled AB Linear Power Amplifier System with 1000W Power Output -- Power Systems Technology, Inc. Microwave Journal Sept. '89 pp.243-245 [A 4 stage amp with a 12-way spliter/combiner in the final!]
Power FET Switches as RF Amplifiers by DeMaw -- QST, April 89, pp30-33. [25 watts]
A Quasi-Complementry Class D HF Power Amplifier -- RF Design, Sept. 1992, pp103-110.