added papers

literature.bib

@@ -4468,6 +4468,41 @@ @inproceedings{STS:VaMoS20
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 2019 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
+@inproceedings{CCP+:SPLTea19,
+	author    = {Chavarriaga, Jaime and Casallas, Rubby and Parra, Carlos and Henao-Mej\'{\i}a, Martha Cecilia and Calle-Archila, Carlos Ricardo},
+	title     = {{Nine Years of Courses on Software Product Lines at Universidad de los Andes, Colombia}},
+	booktitle = SPLC,
+	publisher = ACM,
+	address   = NY,
+	location  = Paris,
+	pages     = {130–-133},
+	isbn      = {9781450366687},
+	doi       = {10.1145/3307630.3342415},
+	year      = 2019
+}
+
+@inproceedings{DLKB:SPLC19,
+	author    = {Debbiche, Jamel and Lignell, Oskar and Kr{\"u}ger, Jacob and Berger, Thorsten},
+	title     = {{Migrating Java-Based Apo-Games into a Composition-Based Software Product Line}},
+	booktitle = SPLC,
+	publisher = ACM,
+	address   = NY,
+	pages     = {98--102},
+	doi       = {10.1145/3336294.3342361},
+	year      = 2019
+}
+
+@inproceedings{GW:ICSE19,
+	author    = {Gazzillo, Paul and Wei, Shiyi},
+	title     = {Conditional Compilation is Dead, Long Live Conditional Compilation!},
+	booktitle = ICSE,
+	publisher = IEEE,
+	address   = Piscataway,
+	year      = 2019,
+	pages     = {105--108},
+	doi       = {10.1109/ICSE-NIER.2019.00035}
+}
+
 @article{AAAM:AIR19,
 	author    = {Alouneh, Sahel and Abed, Sa{\rq}ed and {Al Shayeji}, Mohammad H. and Mesleh, Raed},
 	title     = {{A Comprehensive Study and Analysis on SAT-Solvers: Advances, Usages and Achievements}},