Cristian S. Calude, Elena Calude. Evaluating the Complexity of Mathematical Problems: Part 2. Complex Systems, 18(4), 2010. [doi]
@article{CaludeC10-0, title = {Evaluating the Complexity of Mathematical Problems: Part 2}, author = {Cristian S. Calude and Elena Calude}, year = {2010}, url = {http://www.complex-systems.com/abstracts/v18_i04_a01.html}, researchr = {https://researchr.org/publication/CaludeC10-0}, cites = {0}, citedby = {0}, journal = {Complex Systems}, volume = {18}, number = {4}, }