1. D. Preiss, ?Gâteaux-differentiable functions are somewhere Fréchet differentiable,? Rend. Circ. Mat. Palermo (2),33, No. 1, 122?133 (1984).
2. D. Preiss, ?Gâteaux-differentiable Lipschitz functions need not be Fréchet differentiable on a residual set,? Supplemento Rend. Circ. Mat. Palermo (2), No. 2, 217?222 (1982).
3. V. I. Averbukh and O. G. Smolyanov, ?Different definitions of the derivative in linear topological spaces,? Usp. Mat. Nauk,23, No. 4, 67?116 (1968).
4. V. I. Averbukh, O. G. Smolyanov, and S. V. Fomin, ?Generalized functions and differential equations in linear spaces,? Trudy MMO,24, 132?174 (1971).
5. J. L. Kelley, General Topology, Van Nostrand, Princeton, N.J. (1955).