A Bit of background of mathematics which I have studied ->
I have studied number theory from David M Burton and apostol  introduction to analytic number theory and modular functions and dirichlet series in number theory. 

The problem->

I started working on masters thesis  as per guidance of a professor  not of my Institute who abandoned me and didn't even bothered to tell. 
Research papers studied by me till now are 1.>by T Rivoal and W Zudilin whose title is "a note on odd zeta values".2.Zudilin" 1 of odd zeta values from Zeta 5 to Zeta 25 is irrational by elementary means".  read 3. By Kieth Ball and T rivoal " Infinite number of odd Zeta values are irrational". 

 Now, I started studying paper " Irrationality of values of Riemann zeta Function " By W. Zudilin. It's a big 54 pages paper and I can't complete it in the given time. So, I am thinking to leave it ( although I studied 12 pages but I have some questions and there is no one I can ask but mostly due to the fact that it's a long paper than what can I cover ) . 

>Question - Now, I am thinking to present one or two papers on Sieve Theory. But I have no previous knowledge of Sieve Theory. Although I know about some books in sieve theory like Montgomery ( Topics in multiplicative number theory) , Friedlander and Iwaniac ( Sieve theory: A musical) but my Institute only accepts research papers in masters thesis. 

So, can some researcher here suggest 2 research papers which led to the beginning of the subject of sieve theory and could be studied by the background I have. I will study them and present them along with the papers I already studied. 

Again, over some days I searched for some papers in different domains of ANT over pages of different professors but it doesn't lead me anywhere( It's very hard without any guidence). 

Please help. I am really stressed.