Phonon effects in the excitonic condensation induced in the extended Falicov-Kimball model Thi-Hong-Hai Do, Dinh-Hoi Bui and Van-Nham Phan EPL, 119 4 (2017) 47003 Published online: 03 November 2017 DOI: 10.1209/0295-5075/119/47003