Keller, U. Vertical External Cavity Surface Emitting Lasers (VECSELs). SPIE Digital Library.
Chicago-čujuhus (17. p.)Keller, Ursula. Vertical External Cavity Surface Emitting Lasers (VECSELs). SPIE Digital Library.
MLA-čujuhus (9. p.)Keller, Ursula. Vertical External Cavity Surface Emitting Lasers (VECSELs). SPIE Digital Library.
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