Update: citation

CITATION.cff

@@ -11,6 +11,12 @@ authors:
   - family-names: Quast
     given-names: Ralf
     orcid: 'https://orcid.org/0000-0002-6857-6503'
+identifiers:
+  - type: doi
+    value: 10.5281/zenodo.785071
+    description: >-
+      This DOI represents all versions of the software, and
+      will always resolve to the latest one.
 repository-code: 'https://github.com/octoflar/especia'
 url: 'https://octoflar.github.io/especia'
 abstract: >-
@@ -26,3 +32,19 @@ keywords:
   - spectroscopy
   - evolution strategies
 license: MIT
+references:
+  - type: article
+    scope: Cite this paper if you want to reference the general concepts of the software.
+    authors:
+      - family-names: Quast
+        given-names: Ralf
+      - family-names: Baade
+        given-names: Robert
+      - family-names: Reimers
+        given-names: Dieter
+    title: "Evolution strategies applied to the problem of line profile decomposition in QSO spectra"
+    year: 2005
+    journal: Astronomy and Astrophysics
+    volume: 431
+    issue: 3
+    doi: 10.1051/0004-6361:20041601