1. Allman , M. E. S. A. Bowhill Feed system design for the Urbana incoherent-scatter radar antenna Aeron. Lab., Dept. Elec. Eng., Univ. Ill. Urbana-Champaign 1976
2. Green , J. L. H. G. Selberg E. E. Ferguson Longbranch radio propagation transmitting station WWI at Havana, Illinois U.S. Dept. Commerce Washington, D.C. 1960
3. Hill , R. J. S. A. Bowhill Small-scale fluctuations in D-region ionization due to hydrodynamic turbulence Aeron. Lab., Dept. Elec. Eng., Univ. Ill. Urbana-Champaign 1976
4. Gravity waves in the equatorial mesosphre;Rastogi;J. Atmos. Terr. Phys.,1976