hello,
true. Finding zero's bit tough,unless you are very familiar with the method what he gave in the pap. He confuse little bit by suing many variables and different terminology. Take a circuit and find total number of capacitors. Let us say 3 so there can be max three zero's. Now short all capacitors and check the output (interested variable it could be voltage or capacitor), if it non zero then 3 zero's. if not short two leave one cap open and check if you have non zero output and repeat the experiment with all other capacitors. Out of 3 trails if you get non zero out put at any time, that indicate 2 zero's. If not short one and open 2 capacitors......
believe me i don't prefer this method to find zero's, however the method open circuit time constant to find poles is much simpler.
Try to read the following.
http://www.ece.ucsb.edu/Faculty/rodwell/Classes/mixed_signal/Cochrun_Grabel_MOTC...Thanks,
Raj.