added papers

literature.bib

@@ -4468,6 +4468,25 @@ @inproceedings{STS:VaMoS20
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 2019 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
+@inproceedings{SH:FM19,
+	author    = {Dominic Steinh\"{o}fel and Reiner H\"{a}hnle},
+	title     = {{Abstract Execution}},
+	booktitle = FM,
+	publisher = Springer,
+	address   = BerlinHeidelberg,
+	pages     = {319--336},
+	doi       = {10.1007/978-3-030-30942-8_20},
+	year      = 2019
+}
+
+@misc{UNESCO:19,
+	author       = {United Nations Educational, Scientific and Cultural Organization (UNESCO)},
+	title        = {{Recommendation on Open Educational Resources (OER)}},
+	note         = {Accessed: 2024-03-18},
+	year         = 2019,
+	howpublished = {Website: \url{https://www.unesco.org/en/legal-affairs/recommendation-open-educational-resources-oer}}
+}
+
 @inproceedings{LKL:SPLC19,
 	author    = {Ludwig, Kai and Kr{\"u}ger, Jacob and Leich, Thomas},
 	title     = {{Covert and Phantom Features in Annotations: Do They Impact Variability Analysis?}},
@@ -5825,6 +5844,62 @@ @article{BCKW:Dagstuhl19
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 2018 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
+@proceedings{SPLTea18,
+	editor    = {Acher, Mathieu and Rabiser, Rick and Lopez-Herrejon, Roberto E.},
+	title     = {{SPLTea 2018: Third International Workshop on Software Product Line Teaching}},
+	booktitle = SPLC,
+	publisher = ACM,
+	address   = NY,
+	location  = Gothenburg,
+	pages     = {322},
+	isbn      = {9781450371384},
+	doi       = {10.1145/3233027.3241370},
+	year      = 2018,
+	month     = SEP
+}
+
+@inproceedings{ASR:SPLC18,
+	author    = {Al-Hajjaji, Mustafa and Schulze, Michael and Ryssel, Uwe},
+	title     = {{Similarity Analysis of Product-Line Variants}},
+	booktitle = SPLC,
+	publisher = ACM,
+	address   = NY,
+	location  = Gothenburg,
+	pages     = {226--235},
+	isbn      = {9781450371384},
+	doi       = {10.1145/3233027.3233044},
+	year      = 2018,
+	month     = SEP
+}
+
+@inproceedings{BCF:SPLC18,
+	author    = {Beuche, Danilo and Chale-Gongora, Hugo Guillermo and Fogdal, Thomas},
+	title     = {{International Workshop on Documentation of Industrial Product Line Examples}},
+	booktitle = SPLC,
+	publisher = ACM,
+	address   = NY,
+	location  = Gothenburg,
+	pages     = {295},
+	isbn      = {9781450371384},
+	doi       = {10.1145/3233027.3241373},
+	year      = 2018,
+	month     = SEP
+}
+
+@inproceedings{BEK+:SPLC18,
+	author    = {Butting, Arvid and Eikermann, Robert and Kautz, Oliver and Rumpe, Bernhard and Wortmann, Andreas},
+	title     = {{Modeling Language Variability With Reusable Language Components}},
+	booktitle = SPLC,
+	publisher = ACM,
+	address   = NY,
+	location  = Gothenburg,
+	pages     = {65--75},
+	isbn      = {9781450371384},
+	doi       = {10.1145/3233027.3233037},
+	year      = 2018,
+	month     = SEP
+}
+
 @inproceedings{KES:ICSEC18,
   author = {Christian Kr{\"{o}}her and Sascha El{-}Sharkawy and Klaus Schmid},
   title = {{KernelHaven: An Experimentation Workbench for Analyzing Software Product Lines}},