no. 1
The generalized three circle - and other convexity theorems with application to the construction of envelopes of holomorphy
Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 27 (1977) no. 1, pp. 31-60 
@article{AIHPA_1977__27_1_31_0,
     author = {Borchers, H. J.},
     title = {The generalized three circle - and other convexity theorems with application to the construction of envelopes of holomorphy},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {31--60},
     year = {1977},
     publisher = {Gauthier-Villars},
     volume = {27},
     number = {1},
     mrnumber = {457777},
     zbl = {0376.32009},
     language = {en},
     url = {https://www.numdam.org/item/AIHPA_1977__27_1_31_0/}
}
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Borchers, H. J. The generalized three circle - and other convexity theorems with application to the construction of envelopes of holomorphy. Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 27 (1977) no. 1, pp. 31-60. https://www.numdam.org/item/AIHPA_1977__27_1_31_0/

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