@inproceedings{1055145,
    title = "Approximating derivative securities in f-algebras",
    author = "Brown, D. J. and Huijsmans, Charles B. and de Pagter, Bernardus",
    year = "1991",
    pages = "171-177",
    publisher = "Springer-Verlag",
    booktitle = "Positive operators, riesz spaces, and economics. Proceedings of a conference at Caltech, Pasadena, California, April 16-20, 1990."
}