Kelman, V. M.; Yavor, S. Ya. Electron Optics (Elektronnaya optika), 1968. In Russian.

Кельман В. М., Явор С. Я. Электронная оптика. — 3-е изд., перераб. и доп.
Ленинград : Наука, Ленинградское отделение, 1968.
488 с. Твёрдый издательский переплёт, обычный формат. Тираж 4 200 экз.
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Kel'man, V. M.; Yavor, S. Ya. Electron Optics (Elektronnaya optika). — 3rd ed., rev. and enl.
Leningrad : Nauka, Leningrad Branch, 1968.
488 pp. Hardcover, ordinary format. Print run: 4,200 copies.

This 1968 third edition is a seminal reference work in the field of Soviet physical and technical sciences. Published by the Leningrad branch of "Nauka," it represents the definitive mid-century synthesis of electron optics—the science of controlling charged particle beams, which underpins the development of the modern electronic world.
The book provides an exhaustive theoretical framework for the movement of electrons and ions within complex electromagnetic fields. Kel'man and Yavor meticulously detail the principles of axial symmetry, paraxial optics, and the intricate nature of geometric and chromatic aberrations in electron lenses. Of particular historical and technical interest are the expanded sections on quadrupole lenses and mass spectrometry, areas where Soviet researchers made foundational contributions during the Cold War technological race.
Beyond pure theory, the authors bridge the gap to practical application, illustrating how these optical principles are realized in high-resolution electron microscopes, particle accelerators, and analytical instruments like beta-spectrometers. For the specialist, this edition is valued for its rigorous mathematical derivations and systematic approach, reflecting the high standards of the Leningrad school of physics. It remains a cornerstone volume for collectors of scientific history and engineers involved in the design of vacuum electronics and ion-beam technology.