What is an overview of Lutheran faith-alone systematically taught before Martin Luther? Are there records of Lutheran doctrine of faith-alone taught by theologians prior to  him whether explicitly?  

I read in the Catholic Encyclopedia's article on Justification that Luther was influenced by certain theologians in deriving faith-alone doctrine. Who were they, and can you cite such resources with online reference that any theologian taught faith-alone doctrine? Of course, those who believe the Sola-fide of Luther might say that it was taught by apostle Paul, but I am looking for explicit systematic theology like Luther did. I am not looking for only these particular people mentioned here but anyone. 


  Whether Victorinus, a neo-Platonist, already defended the doctrine of
  justification by faith alone, is immaterial to our discussion. On the
  other hand, it cannot be denied that in the Middle Ages there were a
  few Catholic theologians among the Nominalists (Occam, Durandus,
  Gabriel Biel), who went so far in exaggerating the value of good works
  in the matter of justification that the efficiency and dignity of
  Divine grace was unduly relegated to the background. Of late, Fathers
  Denifle and Weiss have shown that Martin Luther was acquainted almost
  exclusively with the theology of these Nominalists, which he naturally
  and justly found repugnant, and that the "Summa" of St. Thomas and the
  works of other great theologians were practically unknown to him.
I have not found any reference which lists precisely the church fathers that Luther read (and was influenced by) other than Augustine. Certainly of the church fathers, Augustine was a strong influence on Luther's development of his theology.

Martin Luther himself said in 1516 (or 1518? He published two editions of the book) in the preface of the Theologia Germanica:


  Next to the Bible and St. Augustine, no book has ever come into my hands from which I have learnt more of God and Christ,
  and man and all things that are.


This would place the author of Theologia Germanica as one of his primary influences. 

However, there were several contemporaries of Luther which influenced his theology (and indeed the Reformation didn't occur out of a vacuum; Luther was not the only person thinking along sola fide lines, just perhaps the fastest to come to his conclusion.) This included Jacques Lefèvre d'Étaples and Desiderius Erasmus Roterodamus, although it is not immediately apparent to me whether their theology specifically affected his development of sola fide or whether it was simply their approaches to hermeneutics and theology generally.

Johann von Staupitz, Luther's supervisor, and Andreas Rudolph Bodenstein von Karlstadt were both also close aquaintances of Luther who had positions on faith and salvation that were moving in similar circles as sola fide, although it appears that they did not fully accept his position. Certainly they affected his development, though.

Much of this is sourced from Luther's Development of the Doctrine of Justification by Faith Only: Preserved Smith. There were presumably other influences, and you have mentioned Victorinus and the neo-Platonists so I shall not repeat them.