@article{01006693,
title = {On quantum fields and systems with ordered ground state.},
journal = {Memoirs on Differential Equations and Mathematical Physics},
volume = {8},
year = {1996},
zbl = {0872.58079},
language = {en},
url = {http://dml.mathdoc.fr/item/01006693}
}
Elishavili, Merab. On quantum fields and systems with ordered ground state.. Memoirs on Differential Equations and Mathematical Physics, Tome 8 (1996) . http://gdmltest.u-ga.fr/item/01006693/