@InProceedings{KalboussiICCE2013,
author = {Anis Kalboussi and Omar Mazhoud and Ahmed Hadj Kacem and
                  Nizar Omheni},
title = {A Formal Model of Learner's Annotations Dedicated to Web
                  Services Invocation},
booktitle = {Proceedings of the 21st International Conference on
                  Computers in Education (ICEE 2013)},
key = {Annotation},
year = {2013},
month = {November},
publisher = {Asia-Pacific Society of Computers in Education (APSCE)},
}