@article{SJC_2021_15_1_a2,
     author = {Moumoutzis, Nektarios and Christoulakis, Marios and Sifakis, Yiannis and Christodoulakis, Stavros and Pavlov, Radoslav and Pavlova, Lilia},
     title = {Operational {Conceptual} {Modeling} in {Building} and {Sustaining} {Technology} {Enhanced} {Learning} {Communities}},
     journal = {Serdica Journal of Computing},
     pages = {43--84},
     publisher = {mathdoc},
     volume = {15},
     number = {1},
     year = {2021},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SJC_2021_15_1_a2/}
}