[1] Fletcher R.: 
Practical Methods of Optimization. Wiley, New York, 1993. 
MR 0955799[2] Maess G.: Smooth interpolation of curves and surfaces by quadratic splines with minimal curvature. In: Numerical methods and Applications ’84, Sofia, 1985, 75-81.
[3] Kobza J.: 
Optimal interpolation with quadratic splines on simple grid. Dept. Math. Anal. and Appl. Math., Fac. Sci., Palacki Univ., Olomouc, Preprint series 31, Proceed. ODAM’99 (1999), 7-22. 
MR 1767192[4] Kobza J.: Splajny. VUP, Olomouc, 1993 (textbook in Czech).
[6] Kobza J.: Computing solutions of linear difference equations. Dept. Math. Anal. and Appl. Math., Fac. Sci., Palacki Univ., Olomouc, Preprint series 21, 1999; Proceedings SANM XIII, Nectiny 1999, 157-172.
[7] Kobza J.: 
Quadratic splines interpolating derivatives. Acta Univ. Palacki. Olomuc., Fac. rer. nat., Math. 30 (1991), 219-233. 
MR 1166439 | 
Zbl 0758.41005[9] Brugnano L., Trigiante D.: 
Solving Differential Problems by Multistep Initial and Boundary Value Methods. Gordon and Breach Publ., 1998. 
MR 1673796