@article {MR574950,
	title = {Extension of {T}omita-{T}akesaki theory to the unbounded algebra of the canonical commutation relations},
	journal = {Rep. Math. Phys.},
	volume = {16},
	number = {3},
	year = {1979},
	pages = {335{\textendash}352},
	issn = {0034-4877},
	url = {https://doi.org/10.1016/0034-4877(79)90069-7},
	author = {Katavolos, A. and Koch, I.}
}
