Singular Values of Trilinear Forms. - Bo Bernhardsson; Jaak Peetre (Exp. Math., 2001)

Two Remarkable Identities, Called Twos, for Inverses to Some Abelian Integrals. - Peter Lindqvist; Jaak Peetre (Am. Math. Mon., 2001)

Generalized Trigonometric Functions: 10744. - Peter Lindqvist; Jaak Peetre; Jonathan M. Borwein (Am. Math. Mon., 2001)