Omega-0L Systems. - Andrew Szilard (L Systems, 1974)

Characterizing Regular Languages with Polynomial Densities. - Andrew Szilard; Sheng Yu 001; Kaizhong Zhang; Jeffrey O. Shallit (MFCS, 1992)

The Kind Hearted Dragon Prof. Sheng Yu, 1950-2012. - Andrew Szilard (Developments in Language Theory, 2012)