Crown

Any one with experience with cepstra and their interpretation, please help me understand this. I calculated the auto spectum and the cepstrum of a square wave. As expected, On the autospectrum, I got a strong component at the fundamental frequency (1 kHz, in my example) and the odd harmonics, whose amplitude decreasing nicely with the harmonic order. On the cpstrum, I was expecting events (or spikes, if plotted in absolute values) at the corresponding quefrencies of 1/1000, 1/3000, 1/5000, 1/7000, ... . I am not getting this. Please, give me your thoughts