One of the first occurrences of Meta-IV in print appears to be "Programming in the Meta-language: A Tutorial". Dines Bjørner used it in the very beginning of his tutorial as a footnote
This paper provides an informal introduction to the "art" of abstractly specifying software architectures using the VDM meta-language*. A formal treatment of the semantics, as well as a BNF-like concrete syntax, of a large subset of the meta-language is given in following this paper.
The spirit of the Meta-IV specification language is well captured by the following passage
We stress here... that the meta-language is to be used, not for solving algorithmic problems, but for specifying, in an implementation-independent way, the architecture of software. Instead of using informal English mixed with technical jargon, we offer you a very-high-level 'programming' language. We do not offer an interpreter or compiler for this meta-language. And we have absolutely no intention of ever wasting our time trying to mechanize this meta-language. We wish, as we have done in the past, and as we intend to continue doing in the future, to further develop the notation and to express notions in ways for which no mechanical interpreter system can ever be provided.
VDM is a Method. The Meta-IV was the Specification language that accompanied the method, and the VDM-SL is the current standardized form of that language. Since the VDM-SL has become standardized, then one may use Meta-IV to denote the three specific Schools of the VDM which existed from the 1970s onwards:
A brief account of these different Schools is given in the text "Mathematical Approaches to Software Quality". A comprehensive VDM Bibliography is also available.
There is essential universal agreement on what constitutes the VDM. However, there are basically two major Schools of the VDM largely distinguished by notational differences employed in the specification language Meta-IV — the Danish School and the English School."
and further down on the same page
There is also the Polish School, which finds expression through the MetaSoft project. I will frequently need to distinguish between the style of notation and method that I use from those of the other Schools of the VDM. I presume to use the phrase 'the Irish School of the VDM' to draw that distinction.
The Thesis is available online. Other substantial works related to the School are also online.
VDM Europe
The three Schools were brought under a common organizational structure called VDM Europe which held it first international conference in Brussels, Belgium, March 23–26, 1987. At the time funding was provided under the Esprit Programme of the European Union. Meetings were mostly held in the EU Commission buildings in Brussels, Belgium. VDM Europe eventually was dissolved in favor of Formal Methods Europe, founded in 1992. Minutes of the first meeting of FME are available online.
