Geodesic
Orientational ordering in molecular hydrogen. IV. Phase transition of the second kind in the hexagonal lattice
Teoretičeskaâ i matematičeskaâ fizika, Tome 40 (1979) no. 2, pp. 269-274 
V. N. Ryzhov; E. E. Tareeva; T. I. Shchelkacheva. Orientational ordering in molecular hydrogen. IV. Phase transition of the second kind in the hexagonal lattice. Teoretičeskaâ i matematičeskaâ fizika, Tome 40 (1979) no. 2, pp. 269-274. http://geodesic.mathdoc.fr/item/TMF_1979_40_2_a8/
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     title = {Orientational ordering in molecular {hydrogen.~IV.} {Phase} transition of the second kind in the hexagonal lattice},
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Voir la notice de l'article provenant de la source Math-Net.Ru

The orientational ordering in rigid orthohydrogea and paradeuterium with hcp lattice is investigated by the method of the theory of bifurcation of the solutions of nonlinear integral equations. It is shown that in the average field approximation there is a phase transition of the second kind.

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