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- [4] PHASE CONTRAST IN ELECTRON MICROSCOPE IMAGES WITH AN ELECTROSTATIC PHASE PLATE. Optik (Jena), 1975, 42 (03): : 245 - 268
- [5] PHASE-CONTRAST IN ELECTRON-MICROSCOPE IMAGES WITH AN ELECTROSTATIC PHASE PLATE OPTIK, 1975, 42 (03): : 245 - 268