Ivanov, S., Minchev, I. and Vassilev, D. 2012. The optimal constant in the L² Folland-Stein inequality on the quaternionic Heisenberg group. ANNALI SCUOLA NORMALE SUPERIORE - CLASSE DI SCIENZE. 11, 3 (Sep. 2012), 635-662. DOI:https://doi.org/10.2422/2036-2145.200211_002.