>>===== MODE =====>>
citation
<<===== MODE =====<<

https://github.com/seboettg/citeproc-php/issues/37

>>===== RESULT =====>>
(Beethoven and Backhaus 1970)
<<===== RESULT =====<<

>>===== CSL =====>>
<style xmlns="http://purl.org/net/xbiblio/csl" class="in-text" default-locale="en-US" version="1.0" demote-non-dropping-particle="never">
  <info>
      <id />
      <title />
      <updated>2017-05-23T18:03:00+01:00</updated>
  </info>
  <macro name="author-short">
    <names variable="author">
      <name form="short" and="text"/>
      <substitute>
        <names variable="editor"/>
        <names variable="translator"/>
      </substitute>
    </names>
  </macro>
  <macro name="year">
    <date variable="issued">
      <date-part name="year"/>
    </date>
  </macro>
  <citation>
    <layout prefix="(" suffix=")" delimiter="; ">
      <group delimiter=" ">
        <text macro="author-short"/>
        <text macro="year"/>
      </group>
    </layout>
  </citation>
</style>
<<===== CSL =====<<


>>===== INPUT =====>>
[
    {
        "author": [
            {
                "family": "Beethoven",
                "given": "Ludwig van"
            },
            {
                "family": "Backhaus",
                "given": "Wilhelm"
            }
        ],
        "issued": {
            "date-parts": [
                [
                    "[ca. 1970]"
                ]
            ],
            "literal": "[ca. 1970]"
        },
        "number-of-pages": "1 Schallpl.",
        "publisher": "Decca",
        "publisher-place": "[Hamburg]",
        "title": "Wilhelm Backhaus spielt Ludwig van Beethoven",
        "type": "book"
    }
]
<<===== INPUT =====<<