Kovalevskai︠a︡, S. V. (Sofʹi︠a︡ Vasilʹevna), 1850-1891 -- Congresses : The legacy of Sonya Kovalevskaya : proceedings of a symposium / sponsored by the Association for Women in Mathematics and the Mary Ingraham Bunting Institute, held October 25-28, 1985 ; Linda Keen, editor