Ioannis C. Demetriou Algorithm 863: L2WPMA, a Fortran 77 package for weighted least-squares piecewise monotonic data approximation. 6 2007 33 ACM Trans. Math. Softw. 1 http://doi.acm.org/10.1145/1206040.1206046 db/journals/toms/toms33.html#Demetriou07