A non-numerical computation involving sums of many products of finite rotation matrices for spin 3/2. - Inge Frick (SIGSAM Bull., 1974)

Standard LISP for the VAX: a provisional implementation. - Rabbe Fogelholm; Inge Frick (SIGSAM Bull., 1982)

SHEEP and Classification in General Relativity. - Inge Frick; Jan E. Åman (European Conference on Computer Algebra (2), 1985)