[1] N. Biswas: 
On some mappings in topological spaces. Bull. Cal. Math. Soc. 61(1969), 127- 135. 
MR 0281167 | 
Zbl 0215.51605 
[2] W. W. Bledsoe: 
Neighbourly functions. Proc. Amer. Math. Soc. 3 (1952), 114-115. 
MR 0045791 
[3] J. S. Lipiński T. Šalát: 
On the points of quasicontinuity and cliquishness of functions. Czechoslovak Math. Ј. 21 (96) (1971), 484-489. 
MR 0287517 
[4] A. Neubrunnová: 
On certain generalizations of the notion of continuity. Mat. čas. 23 (197З), З74-З80. 
MR 0339051 
[5] H. P. Thielman: 
Types of functions. Аmer. Math. Monthly 60 (195З), 156-161. 
MR 0052495