JETP, Vol. 44,
No. 1,
p. 70 (July 1976)
(Russian original - ZhETF,
Vol. 71,
No. 1,
p. 135,
July 1976
)
Nonlinear Doppler-free narrow resonances in optical transitions and annihilation radiation of positronium
V.S. Letokhov, V.G. Minogin
Received: January 15, 1976
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