On the Equivalence of Viscosity Solutions and Weak Solutions for a Quasi-Linear Equation. - Petri Juutinen; Peter Lindqvist; Juan J. Manfredi (SIAM J. Math. Anal., 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)