Update dtsms.md

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 # A Systematic Cross-Domain Mapping Study on the Software Engineering of Digital Twins
 
+Manuela Dalibor, Nico Jansen, Bernhard Rumpe, David Schmalzing, Louis Wachtmeister, Manuel Wimmer, and Andreas Wortmann
+
+<p>
+Digital Twins are currently investigated as the technological backbone for providing an enhanced understanding and management
+of existing systems as well as for designing new systems in various domains, e.g., ranging from single manufacturing components
+such as sensors to large-scale systems such as smart cities. Given the diverse application domains of Digital Twins, it is not
+surprising that the characterization of the term Digital Twin, as well as the needs for developing and operating Digital Twins are
+multi-faceted. Providing a better understanding what the commonalities and differences of Digital Twins in different contexts
+are, may allow to build reusable support for developing, running, and managing Digital Twins by providing dedicated concepts,
+techniques, and tool support. In this paper, we aim to uncover the nature of Digital Twins based on a systematic mapping study
+which is not limited to a particular application domain or technological space. We systematically retrieved a set of 1471 unique
+publications of which 529 were identified as potentially relevant and of which finally 356 were selected for further investigation.
+In particular, we analyzed the types of research and contributions made for Digital Twins, the expected properties Digital Twins
+have to fulfill, how Digital Twins are realized and operated, as well as how Digital Twins are finally evaluated. Based on this
+analysis, we also contribute a novel feature model for Digital Twins as well as several observations to further guide future software
+engineering research in this area.
+</p>
+
 For better transparency and replicability, this directory provides
 * a list of the [initial 2002 publications](2021-DTSMS-InitialSearch.xlsx) and
-* a list of the [356 included publication](2021-DTSMS-Included.xlsx).
+* a list of the [356 included publications](2021-DTSMS-Included.xlsx).