By Nelson J.   Picken R.   in General Relativity and Gravitation

ISSN:0001-7701|43|3|777-795

Springer Publishing Company ‎(2011)‎

Access to resources Favorite 11.048364

By Mackaay M.   Picken R.   in Advances in Mathematics

ISSN:0001-8708|170|2|287-339

Academic Press‎(2002)‎

Access to resources Favorite 11.048364