6 papers:
STOC-2014-Massoulie #community #detection- Community detection thresholds and the weak Ramanujan property (LM), pp. 694–703.
STOC-2012-KaufmanL #graph #symmetry #transitive- Edge transitive ramanujan graphs and symmetric LDPC good codes (TK, AL), pp. 359–366.
STOC-2009-BatsonSS- Twice-ramanujan sparsifiers (JDB, DAS, NS), pp. 255–262.
STOC-2008-Ben-AroyaT #combinator #graph #using- A combinatorial construction of almost-ramanujan graphs using the zig-zag product (ABA, ATS), pp. 325–334.
CADE-1994-ClarkeZ #problem #proving #symbolic computation #theorem proving- Combining Symbolic Computation and Theorem Proving: Some Problems of Ramanujan (EMC, XZ), pp. 758–763.
STOC-1986-LubotzkyPS- Explicit Expanders and the Ramanujan Conjectures (AL, RP, PS), pp. 240–246.