A NEW X-RAY AMPLIFIER PUMPED BY THE KINETIC ENERGY OF CLUSTERS G. W. KENTWELL, H. HORA, J. P. SHEERIN, W. C. STWALLEY et J. C. WANG J. Phys. Colloques, 47 C6 (1986) C6-165-C6-170 DOI: 10.1051/jphyscol:1986623