
Yuhong Dai, K. Schittkowski
(2008): A sequential quadratic programming
algorithm with nonmonotone line search, Pacific Journal of
Optimization, Vol. 4, 335351 

K. Schittkowski, NLPQLP: A Fortran implementation of a sequential quadratic
programming algorithm with distributed and nonmonotone line Search  User's
guide, Version 4.2, Report, Department of Computer Science, University of Bayreuth (2009) 

K. Schittkowski, NLPQL: A Fortran subroutine for
solving constrained nonlinear programming problems,
Annals of Operations Research, Vol. 5, 485500 (1985/86) 

K. Schittkowski (2010):
A robust implementation of a
sequential quadratic programming algorithm with successive error
restoration, Optimization Letters, Vol. 5, 283296
(2011) 