On the algebraic structure of rooted trees

Shashanka Ubaru, Lior Horesh, et al.

Journal of Biomedical Informatics

I.K. Pour, D.J. Krajnovich, et al.

SPIE Optical Materials for High Average Power Lasers 1992

Juliann Opitz, Robert D. Allen, et al.

Microlithography 1998

Arnon Amir, Michael Lindenbaum

IEEE Transactions on Pattern Analysis and Machine Intelligence