@article{ASNSP_2012_5_11_3_635_0, author = {Ivanov, Stefan and Minchev, Ivan and Vassilev, Dimiter}, title = {The optimal constant in the $L^2$ {Folland-Stein} inequality on the quaternionic {Heisenberg} group}, journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze}, pages = {635--652}, publisher = {Scuola Normale Superiore, Pisa}, volume = {Ser. 5, 11}, number = {3}, year = {2012}, mrnumber = {3059840}, zbl = {1276.53057}, language = {en}, url = {http://www.numdam.org/item/ASNSP_2012_5_11_3_635_0/} }