@inbook{inbook5905801a,
title   = {Observations from variability modelling approaches at the architecture level},
author = {Allian, Ana Paula and Capilla, Rafael and Nakagawa, Elisa Yumi},
year = {2019},
doi = {10.1201/9780429022067},
publisher = {Auerbach Publications},
journal   = {Software engineering for variability intensive systems foundations and applications}
}