Open Science Harvester of NAS of Ukraine

Generalized Symmetries of Massless Free Fields on Minkowski Space

by Pohjanpelto, J., Anco, S.C.
Published in Symmetry, Integrability and Geometry: Methods and Applications (2008)

On the Structure of Lie Pseudo-Groups

by Olver, P.J., Pohjanpelto, J., Valiquette, F.
Published in Symmetry, Integrability and Geometry: Methods and Applications (2009)