1. I. V. Bulgarovskaya, L. A. Novakovskaya, Yu. G. Fyodorov, and Z. V. Zvonkova, “Crystalline structure of pyromellitic diimide,” Kristallo- grafiya, 21, No. 3, 515–519 (1976).
2. E. Matzat, “Die Kristallstruktur des Phtalimides (Kladnoit),” Acta Crystallogr., B24, No. 2, 415–418 (1972).
3. A. I. Sobolev, L. A. Chetkina, G. A. Gol’der, Yu. G. Fyodorov, and V. E. Zavodnik, “X-ray studies on naphthalimide,” Kristallografiya, 18, No. 6, 1157–1161 (1973).
4. M. K. Hargreaves, J. G. Pritchard, and H. D. Dave, “Cyclic carboxylic monoimides,” Chem. Rev., 70, No. 4, 439–469 (1970).
5. C. S. Petersen, “The crystal structure of N-(a-glutaramide)-4-bromo-naphthalimide,” Acta Chem. Scand., 23, No. 7, 2389–2994 (1969).