no. 3
Naturally reductive homogeneous spaces and generalized Heisenberg groups
Compositio Mathematica, Tome 52 (1984) no. 3, pp. 389-408. 
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     author = {Tricerri, F. and Vanhecke, L.},
     title = {Naturally reductive homogeneous spaces and generalized {Heisenberg} groups},
     journal = {Compositio Mathematica},
     pages = {389--408},
     publisher = {Martinus Nijhoff Publishers},
     volume = {52},
     number = {3},
     year = {1984},
     mrnumber = {756730},
     zbl = {0551.53028},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1984__52_3_389_0/}
}
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Tricerri, F.; Vanhecke, L. Naturally reductive homogeneous spaces and generalized Heisenberg groups. Compositio Mathematica, Tome 52 (1984) no. 3, pp. 389-408. http://archive.numdam.org/item/CM_1984__52_3_389_0/

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