Add a full citation for the Fu algorithm
Add a full citation for the Fu algorithm

Also, do not split the URL into multiple lines.

Titan-C/sympy,postvakje/sympy,sampadsaha5/sympy,aktech/sympy,chaffra/sympy,yashsharan/sympy,madan96/sympy,souravsingh/sympy,rahuldan/sympy,hargup/sympy,sampadsaha5/sympy,rahuldan/sympy,souravsingh/sympy,chaffra/sympy,sampadsaha5/sympy,aktech/sympy,postvakje/sympy,drufat/sympy,Titan-C/sympy,rahuldan/sympy,aktech/sympy,drufat/sympy,jaimahajan1997/sympy,yashsharan/sympy,souravsingh/sympy,hargup/sympy,drufat/sympy,kaushik94/sympy,ChristinaZografou/sympy,jaimahajan1997/sympy,yashsharan/sympy,jaimahajan1997/sympy,madan96/sympy,skidzo/sympy,kaushik94/sympy,ChristinaZografou/sympy,Titan-C/sympy,skidzo/sympy,hargup/sympy,madan96/sympy,skidzo/sympy,ChristinaZografou/sympy,kaushik94/sympy,chaffra/sympy,postvakje/sympy