Push Flow Relabel Algorithm

Can someone provide useful links for Push Flow Relabel Algorithm and it’s implementation ?
I have read the topcoder tutorial but half way through the article the proofs became tough rather.
I would appreciate some help and if possible a easier way of explanation of the above.

check these links -

 http://theory.stanford.edu/~trevisan/cs261/lecture12.pdf 
 http://www.imada.sdu.dk/~jbj/DM85/preflownew.pdf 
 https://www.ads.tuwien.ac.at/teaching/archiv/praktika/CherkasskyGoldberg-1995-MaxFlow.pdf 

for program -

 https://sites.google.com/site/indy256/algo/preflow 
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