Dear friend, very interesting question. I am interested to your question and will explain in detail soon (similar to my case). A bit hurry for this time, please remind me.
However, the easiest way is searching the related document by typing the keywords into google scholar. You will find some related articles.
If yet to find the articles, do not hesitate to let me know. InsyaALLAH I will help you in detail.
Good luck. Dr Zol Bahri - Universiti Malaysia Perlis
If I understand your question right and you're afraid of convergence problems: Just do a "symmetric" contact dafiniton and you don't have to think about mesh size on contact or target side (only disadvantage of "symmetric" is that you can't check contact forces).