@article {1199,
	title = {Multiplex Pure Rotational Coherent Anti-Stokes Raman Spectroscopy in a Molecular Beam},
	journal = {J. Raman Spectroscopy},
	volume = {21},
	year = {1990},
	pages = {819},
	author = {N. Bloembergen and K. H. Chen and C.Z. Lu and E. Mazur}
}
