Johnson, R. D., ed. (2002). "CCCBDB What's a cm-1?". Computational Chemistry Comparison and Benchmark DataBase. National Institute of Standards and Technology. doi:10.18434/T47C7Z. Retrieved 2013-11-13.
Johnson, R. D., ed. (2002). "CCCBDB What's a cm-1?". Computational Chemistry Comparison and Benchmark DataBase. National Institute of Standards and Technology. doi:10.18434/T47C7Z. Retrieved 2013-11-13.