1. Achariyapaopan , T. Bellcore National Radio Engineer's Conference Record 1986
2. A Study of Frequency Selective Fading for a Microwave Line-of-Sight Narrowband Radio Channel;Babler;Bell System Technical Journal,1972
3. Multipath Propagation at 4, 6 and 11 GHz;Barnett;Bell System Technical Journal,1972