Upper-Air Fluorescence as a Tool in X-Ray Astronomy and Searches for X-Rays from NP 0532 and Other Pulsars Charman, W. N. ; Drever, R. W. P. ; Fruin, J. H. ; Jelley, J. V. ; Elliot, J. L. ; Fazio, G. G. ; Hearn, D. R. ; Helmken, H. F. ; Rieke, G. H. ; Weekes, T. C. Abstract Publication: Non-Solar X- and Gamma-Ray Astronomy Pub Date: 1970 Bibcode: 1970IAUS...37...41C