Algorithm 853: An efficient algorithm for solving rank-deficient least squares problems. - Leslie Foster; Rajesh Kommu (ACM Trans. Math. Softw., 2006)

Stable and Efficient Gaussian Process Calculations. - Leslie Foster; Alex Waagen; Nabeela Aijaz; Michael Hurley; Apolonio Luis; Joel Rinsky; Chandrika Satyavolu; Michael J. Way; Paul R. Gazis; Ashok Srivastava (J. Mach. Learn. Res., 2009)