M. L. Nico,  "Triangles and Pyramids, or something like that, Analytical Paper Youth Partnership, em http://pjp-eu.coe.int/documents/1017981/9907025/Triangles+and+Pyramids+-+Analysis+of+Applicants+Responses.pdf/da8f9c63-3830-f13a-0611-70f18e835d7d", in Triangles and Pyramids, or something like that, Analytical Paper Youth Partnership, em http://pjp-eu.coe.int/documents/1017981/9907025/Triangles+and+Pyramids+-+Analysis+of+Applicants+Responses.pdf/da8f9c63-3830-f13a-0611-70f18e835d7d, 2017