Richard Mark Hollenbeck Campbell, S. L., Hollenbeck, R., Yeomans, K., & Zhong, Y. (1998). Mixed symbolic-numerical computations with general DAEs - I: System properties. NUMERICAL ALGORITHMS, 19(1-4), 73–83. https://doi.org/10.1023/A:1019154423096 Campbell, S. L., & Hollenbeck, R. (1996). Automatic differentiation and implicit differential equations. In C. B. B. Berz, G. Corliss, & A. Griewank (Eds.), Computational differentiation: Techniques, applications, and tools. Philadelphia: SIAM.