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- [3] THE CURRENT IN THE ELECTRON IMMERSION OBJECTIVE PROCEEDINGS OF THE PHYSICAL SOCIETY OF LONDON SECTION B, 1952, 65 (390): : 421 - 425
- [5] GEOMETRICAL OPTICS OF A 5-ELECTRODE IMMERSION OBJECTIVE RADIO ENGINEERING AND ELECTRONIC PHYSICS-USSR, 1971, 16 (04): : 715 - &