no. 2
Pseudoconcave Lie groups
Compositio Mathematica, Tome 25 (1972) no. 2, pp. 109-115. 
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     author = {Andreotti, Aldo and Huckleberry, Alan},
     title = {Pseudoconcave {Lie} groups},
     journal = {Compositio Mathematica},
     pages = {109--115},
     publisher = {Wolters-Noordhoff Publishing},
     volume = {25},
     number = {2},
     year = {1972},
     mrnumber = {316752},
     zbl = {0239.32018},
     language = {en},
     url = {http://www.numdam.org/item/CM_1972__25_2_109_0/}
}
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Andreotti, Aldo; Huckleberry, Alan. Pseudoconcave Lie groups. Compositio Mathematica, Tome 25 (1972) no. 2, pp. 109-115. http://www.numdam.org/item/CM_1972__25_2_109_0/

Adams, Frank J. Lectures on Lie Groups, W. A. Benjamin, 1969. | MR | Zbl

Morimoto, Ahihiko On the classification of noncompact complex abelian Lie groups, Trans. Amer. Math., Soc., 123 (1966), pp 200-228. | MR | Zbl