Geodesic
On manifolds of~phase coexistence
Teoretičeskaâ i matematičeskaâ fizika, Tome 30 (1977) no. 1, pp. 40-47

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Using a theorem on convex functions due to Israel, it is shown that a point of coexistence of $n+1$ phases cannot be isolated in the space of interactions, but lies on some “infinite dimensional manifold”. 
@article{TMF_1977_30_1_a5,
     author = {D. Ruelle},
     title = {On manifolds of~phase coexistence},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {40--47},
     publisher = {mathdoc},
     volume = {30},
     number = {1},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1977_30_1_a5/}
}
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D. Ruelle. On manifolds of~phase coexistence. Teoretičeskaâ i matematičeskaâ fizika, Tome 30 (1977) no. 1, pp. 40-47. http://geodesic.mathdoc.fr/item/TMF_1977_30_1_a5/