@article {k23,
	title = {Beyond linear response: Line shapes for coupled spins or oscillators via direct calculation of dissipated power},
	journal = {The Journal of Chemical Physics},
	volume = {80},
	year = {1984},
	pages = {2352{\textendash}2362},
	publisher = {AIP Publishing},
	author = {Kosloff, Ronnie and Ratner, Mark A}
}
