TY  - BOOK
AU  - Calderón Valle,Roberto Daniel
TI  - El copo de nieve: 30 paradojas matemáticas 
AV  - QA95 ebook 
PY  - 2018///
CY  - Quito, Ecuador
PB  - Editorial Universitaria UTE
KW  - Mathematical recreations
N1  - Includes bibliographical references
UR  - https://www.digitaliapublishing.com/a/160299/
ER  -