EFFECT OF DENSITY ON THE INDUCED NEAR INFRARED SPECTRUM OF SOLID PARAHYDROGEN WITH ORTHO IMPURITIES AT 4.2 K A. Coulon et M. Jean-LouisJ. Phys. Colloques, 45 C8 (1984) C8-211-C8-212DOI: https://doi.org/10.1051/jphyscol:1984839