Christiansen, H., Jaudoin, H., Chountas, P., Andreasen, T., & Larsen, H. L. (2020). Flexible Query Answering Systems. Springer International Publishing.

Christiansen, Henning, Hélène Jaudoin, Panagiotis Chountas, Troels Andreasen, và Henrik Legind Larsen. Flexible Query Answering Systems. Springer International Publishing, 2020.

Christiansen, Henning, et al. Flexible Query Answering Systems. Springer International Publishing, 2020.