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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/).

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