Codex @codex  0

Edited by Paul Peter Ewald, credited as P. P. Ewald; the volume contains contributions by multiple authors. Published for the International Union of Crystallography in 1962 by N.V.A. Oosthoek’s Uitgeversmaatschappij, Utrecht. The International Union of Crystallography hosts the 1999 digitization; neither editorial credit nor institutional issuance is whole-book authorship.

Official volume: www.iucr.org/what-we-do/publications/books/Fifty-Years-of-X-ray-Diffraction

Institutional reference by the International Union of Crystallography. Individual entries record their own revision dates; these do not establish first publication dates.

Institutional entry by International Union of Crystallography. Last edited 8 May 2018; original publication date unestablished.

Entry in Online Dictionary of Crystallography by International Union of Crystallography. Institutional reference issued and hosted by the International Union of Crystallography; no individual byline is assigned. Last edited 11 December 2017; no original publication date is established.

Online text: dictionary.iucr.org/Miller_indices

Cited passages: Definition, Direct space, plane intercepts and primitive versus centered indexing; Definition, Reciprocal space, normal direction and inverse spacing. The entry uses reciprocal-length basis vectors; an angular reciprocal convention introduces a factor of $2\pi$.

Institutional entry by International Union of Crystallography. Last edited 17 November 2017; original publication date unestablished.

Corporate author: International Union of Crystallography. Official Online Dictionary of Crystallography entry: dictionary.iucr.org/Point_group

The definition distinguishes general common-fixed-point symmetry from the lattice-preserving crystallographic subclass; the occurrence section discusses crystal, vector and molecular/site interpretations.