Zettelmarkup: Citation Key manual manual zettelmarkup zettelstore zmk 00001007010000 00001007040300 00001007721200 00001007010000 00001007040300 00001007721200 1 (c) 2020-present by Detlef Stern 00010101000000 00001007040000 en EUPL-1.2-or-later 20220218133447 20220218133447 public A citation key references some external material that is part of a bibliographical collection. Currently, Zettelstore implements this only partially, it is work in progress. However, the syntax is: beginning with a left square bracket and followed by an at sign character (@, U+0040), a the citation key is given. The key is typically a sequence of letters and digits. If a comma character (,, U+002C) or a vertical bar character is given, the following is interpreted as inline elements. A right square bracket ends the text and the citation key element.