About twin paradox
On the concept of energy in the classical mechanics and relativity
Les dérivées des vecteurs unités de base en directions des coordonnées curvilignes dans l'espace de Riemann
Izvod jediničnog osnovnog vektora u pravcu krivolinijske koordinate u Euklidovom prostoru
The metrics of a twodimensional space with geodesics represented by a linear equation
On the coordinate systems in the special theory of relativity
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