[1] Barbuti U., Guerra S.: 
Osservazioni sopra una nota precedente. Rend. Ist. di Matem. Univ. Trieste 3 (1971), 1-12. 
MR 0313892[2] Bellen A.: 
Non-cyclic transformation and uniform convergence of the Picard sequences. Rend. Ist. di Matem. Univ. Trieste 4 (1972), 1-7. 
MR 0336725[3] Bessaga C.: 
On the converse of the Banach fixed point principle. Colloq. Math. 7 (1959), 41-43. 
MR 0111015 | 
Zbl 0089.31501[4] Browder F.E., Petryshyn W.V.: 
The solution by iteration of nonlinear functional equations in Banach spaces. Bull. Amer. Soc. 72 (1966), 571-575. 
MR 0190745 | 
Zbl 0138.08202[5] Belluce L.P., Kirk W.A.: 
Some fixed point theorems in metric and Banach spaces. Canad. Math. Bull. 12 (1969), 481-491. 
MR 0250148 | 
Zbl 0195.42901[6] Coroian L.: 
$\alpha _{DP}$-condensing mappings. Univ. of Cluj-Napoca, Preprint No. 3, 1988, 17-22. 
MR 0975265[7] Iseki K.: 
Fixed point theorems in generalized complete metric space. Tamkang J. Math. 5 (1974), 213-219. 
MR 0365542[8] Janoš L.: 
A converse of the Banach's contraction theorem. Proc. Amer. Math. Soc. 18 (1967), 287-289. 
MR 0208589[9] Janoš L., Ko H.-M., Tan K.-K.: 
Edelstein's contractivity and attractors. Proc. Amer. Math. Soc. 76 (1979), 339-344. 
MR 0537101 | 
Zbl 0411.54031[10] Leader S.: 
Uniformly contractive fixed points in compact metric spaces. Proc. Amer. Math. Soc. 86 (1982), 153-158. 
MR 0663887 | 
Zbl 0507.54040[11] Meyers P.R.: 
A converse to Banach's contraction theorem. J. Res. Nat. Bureau of Standard 71B (1971), 73-76. 
MR 0221469[12] Opoijcev W.I.: 
The converse of the contraction mapping principle (in Russian). Usp. Mat. Nauk 31 (1976), 169-198. 
MR 0420591[13] Rhoades B.E.: 
Contractive definitions revisited. Contemporary Math. 21 (1983), 189-205. 
MR 0729516 | 
Zbl 0528.54037[14] Rus I.A.: Principii şi aplicaţii ale teoriei punctului fix. Ed. Dacia, Cluj-Napoca, 1979.
[15] Rus I.A.: 
Generalized contractions. Univ. Cluj-Napoca, Preprint No. 3, 1983, 1-30. 
MR 0782679[16] Rus I.A.: 
Bessaga mappings. Proc. Colloq. Approx. Optimization, Cluj-Napoca, 1984, 165-175. 
MR 0847265 | 
Zbl 0572.54040[17] Rus I.A.: 
Picard mappings: results and problems. Univ. Cluj-Napoca, Preprint No. 6, 1987, 55-64. 
MR 0993513 | 
Zbl 0654.54030[19] Rus I.A.: 
Basic problems of the metric fixed point theory revisited. Studia Univ. Babeş-Bolyai 34 (1989), 61-69. 
MR 1073756 | 
Zbl 0878.54028[20] Rus I.A., Mureşan A.S.: 
Examples and counterexamples for Janoš mappings. Univ. Cluj-Napoca, Preprint No. 3, 1984, 63-66. 
MR 0807962[22] Volčič A.: 
Some remarks on a S. Chu and R.D. Moyer's theorem. Rend. Accad. Naz. Lincei 49 (1970), 236-241. 
MR 0295325