Yu M Vas'kovskiĭ, I A Gordeeva, R E Rovinskiĭ and I P Shirokova
Experimental determination of the parameters of a laser jet and verification of ionization equilibrium
Sov. J. Quantum Electron. 21 984-986
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http://dx.doi.org/10.1070/QE1991v021n09ABEH004054