Bidimensional fractal aggregates obtained by means of a 100% pasting process during collisions of particles submitted to an attractive central field of gravity -Jean-François Colonna fractal aggregate- [Agrégats fractals bidimensionnels obtenus par collage de 100% des particules lors de leurs collisions, dans un champ de gravitation central attractif -l'agrégat fractal de Jean-François Colonna-]
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