Construction of Exponential Tension B-splines of Arbitrary Order. - Per Erik Koch; Tom Lyche (Curves and Surfaces, 1991)

Interpolation with Exponential B-Splines in Tension. - Per Erik Koch; Tom Lyche (Geometric Modelling, 1992)

Control curves and knot insertion for trigonometric splines. - Per Erik Koch; Tom Lyche; Marian Neamtu; Larry L. Schumaker (Adv. Comput. Math., 1995)