N. CYR and M. TETU, "Solitary resonance observed in the saturated absorption spectrum of the 87Rb D2 line,"
in Quantum Electronics and Laser Science Conference, A. Nurmikko, D. Pritchard, D. Chemla, and T. McIlrath, eds.,
Vol. 12 of OSA Technical Digest
(Optical Society of America, 1989), paper THCC3.