Bortolot et al. 1969
Bortolot, V.J., J.F. Clauser, and P. Thaddeus, 1969: Upper limits to the intensity of background radiation at λ =1.32, 0.559, AND 0.359 mm. Phys. Rev. Lett., 22, 307-310, doi:10.1103/PhysRevLett.22.307.
From observations of interstellar optical absorption lines of CN, CH, and CH+ we are able to impose upper limits, at three wavelengths, on the intensity of background radiation in the interstellar medium. These limits are consistent with the existence of thermal background radiation at a temperature of ~3°K, but can be reconciled with the results of a recent rocket observation by Shivanandan, Houck, and Harwit only if the intense flux which they report is concentrated into a sharp line which happens to avoid the molecular resonances, or if this flux is of local origin.
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Bortolot, V.J., Clauser, J.F., and Thaddeus, P.: Upper limits to the intensity of background radiation at λ =1.32, 0.559, AND 0.359 mm, Phys. Rev. Lett., 22, 307-310, doi:10.1103/PhysRevLett.22.307, 1969.
Bortolot, V.J., J.F. Clauser, and P. Thaddeus (1969), Upper limits to the intensity of background radiation at λ =1.32, 0.559, AND 0.359 mm, Phys. Rev. Lett., 22, 307-310, doi:10.1103/PhysRevLett.22.307.
Bortolot, V.J., J.F. Clauser, and P. Thaddeus, 1969: Upper limits to the intensity of background radiation at λ =1.32, 0.559, AND 0.359 mm. Phys. Rev. Lett., 22, 307-310, doi:10.1103/PhysRevLett.22.307.
Bortolot, V.J., Clauser, J.F., & Thaddeus, P. 1969, Phys. Rev. Lett., 22, 307, doi:10.1103/PhysRevLett.22.307.
Bortolot VJ, Clauser JF, Thaddeus P. Upper limits to the intensity of background radiation at λ =1.32, 0.559, AND 0.359 mm, Phys Rev Lett 1969;22:307-310. doi:10.1103/PhysRevLett.22.307.
V.J. Bortolot, J.F. Clauser, P. Thaddeus, Phys. Rev. Lett. 22, 307-310, doi:10.1103/PhysRevLett.22.307 (1969).
