Title: L2CXFT, Fortran lines 1469, manual 61 pp. Accompanies article Algorithm 742: L2CXFT, a Fortran subroutine for least squares data fitting with non-negative second divided differences. ACM Transactions on Mathematical Software (ACM TOMS), Vol.21, No.1, March 1995, pp 98-110. In «Collected Algorithms of TOMS», serial number 742 (GAMS-Guide to Available Mathematical Software, National Institute of Standards and Technology 742/K5/K1a2a/L8g/L8h) 

Title: CXFTV2, Fortran lines 1883, manual 56 pp. Accompanies article CXFTV2: A Fortran subroutine for the discrete least squares convex approximation. Computer Physics Communications (CPC), 100 (1997), pp 297-310. In CPC Program Library http://cpc.cs.qub.ac.uk/summaries/ADFF 

Title: L1PMA, Fortran lines 1146, manual 39 pp. Accompanies article L1PMA: A Fortran 77 package for best L1 piecewise monotonic data smoothing. Computer Physics Communications (CPC), 151 (2003), pp 315-338. In CPC Program Library http://cpc.cs.qub.ac.uk/summaries/ADRF 

Title: L2CXCV, Fortran lines 2920, e-manual 1.3 ΜΒ. Accompanies article L2CXCV: A FORTRAN 77 package for least squares convex / concave data smoothing. Computer Physics Communications, 174 (2006), pp 643-668. In CPC Program Library http://cpc.cs.qub.ac.uk/summaries/ADXM_v1_0 

Title: L2WPMA, Fortran lines 1812, manual 66 pp. Accompanies article Algorithm 863: L2WPMA: A Fortran 77 subroutine for weighted least squares piecewise monotonic data fitting. ACM Transactions on Mathematical Software, Vol. 33, No 1, pp 1-19, March 2007. In «Collected Algorithms of TOMS», serial number 863.