![](https://www.pdfsearch.io/img/2c3b908b57e91d2128ef41bf1d21a22b.jpg) Date: 2015-04-28 14:26:59
| | Boletín Electrónico de la Academia Colombiana de Ciencias Exactas, Físicas y Naturales Medio semanal de divulgación de la Academia
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