00463nam a2200157Ia 450000100060000000800410000604000130004708200160006010000220007624501000009826000480019830000110024654600070025770000200026470000210028424381140410s9999    xx            000 0 und d  cPK-LaUMT  a 535bHEE-W  aA. C. S. van Heel  aWhat is light?btranslated from the DutchcA. C. S. van Heel<>C. H. F. Velzel<>J.L.J. Rosenfeld  aLondon,UK:bWorld University Library,c1968  a255 p.  aEN  aC. H. F. Velzel  aJ.L.J. Rosenfeld