[1] S. Kene Crossley S. K. Hildebrand: 
Semi-topological properties. Fund. Math. 74 (1972), 233-254. 
MR 0301690[2] N. Leuine: 
Semi-open sets and semi-continuity in topological spaces. Amer. Math. Monthly 70 (1963), 36-41. 
MR 0166752[3] P. E. Long D. A. Carnahan: 
Comparing almost continuous functions. Proc. Amer. Math. Soc. 38 (1973), 413-418. 
MR 0310824[4] P. E. Long L. L. Herrington: 
Properties of almost-continuous functions. Boll. Un. Mat. Ital. (4) 10 (1974), 336-342. 
MR 0380711[5] O. Njåstad: 
On some classes of nearly open sets. Pacific J. Math. 15 (1965), 961-970. 
MR 0195040[6] M. K. Singal A. R. Singal: 
Аlmost continuous mappings. Yokohama Math. J. 16 (1968), 63-73. 
MR 0261569