P -sub-Laplacian representation formulae on H -type groups

Bilyachenko A.N., Kulakova A.N., Levitsky M.M., Korlyukov A.A., Khrustalev V.N., Vologzhanina A.V., Titov A.A., Dorovatovskii P.V., Shul'pina L.S., Lamaty F., Bantreil X., Villemejeanne B., Ruiz C., Martinez J., Shubina E.S., Shul'pin G.B.

Topolyan A.P., Belyaeva M.A., Slyundina M.S., Ilyushenkova V.V., Formanovsky A.A., Korshun V.A., Borisov R.S.