entropy-18-00160
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Entropy 2016, <strong>18</strong>, 160 20 of 20<br />
23. Barbilian, D. Opera Didactica, Volume I; Didactic and Pedagogical Publishing House: Bucharest, Romania,<br />
1968. (In Romanian)<br />
24. Barbilian, D. Opera Didactica, Volume II; Didactic and Pedagogical Publishing House: Bucharest, Romania,<br />
1971. (In Romanian)<br />
25. Barbilian, D. Opera Didactica, Volume III; Didactic and Pedagogical Publishing House: Bucharest, Romania,<br />
1974. (In Romanian)<br />
26. Mihăileanu, N. Complements of Geometry: Analytical, Projective and Differential; Didactic and Pedagogical<br />
Publishing House: Bucharest, Romania, 1972. (In Romanian)<br />
c○ 2016 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access<br />
article distributed under the terms and conditions of the Creative Commons Attribution<br />
(CC-BY) license (http://creativecommons.org/licenses/by/4.0/).