BVN refers til the numbering of works in: Bendt Viinholt Nielsen: Rued Langgaards Kompositioner (Rued Langgaard's Compositions. An Annotated Catalogue of Works. With an English Introduction). Odense University Press, 1991.
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Rued Langgaard is from 2014 published by Edition Wílhelm Hansen, Copenhagen, and WH is also the home of the Rued Langgaard Edition.