Journal of Lie Theory Vol. 13, No. 1, pp. 91132 (2003) 

Lie Algebras Graded by the Root System BC$_1$Georgia Benkart and Oleg SmirnovG. BenkartDepartment of Mathematics University of Wisconsin Madison, Wisconsin 53706 benkart@math.wisc.edu, and O. Smirnov Department of Mathematics College of Charleston Charleston, South Carolina 29424 smirnov@cofc.edu Abstract: We classify the Lie algebras that are graded by the nonreduced root system BC$_1$ and determine their central extensions, derivations, and invariant forms. Full text of the article:
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