# A.M. Iaglom, I. M. Iaglom, Probleme neelementare tratate elementat. Ed tehnică, Bucureşti, 1962
# I. Tomescu, Probleme de combinatorică şi teoria grafurilor, ed didactică şi pedagogică. Bucureşti, 1981
# Colecţia Ginfo

# ["acm.uva.es":acm.uva.es]
# ["ipsc.ksp.sk":ipsc.ksp.sk]
# ["algoritmus.org/index.php":algoritmus.org/index.php]
# ["http://www.research.att.com/~njas/sequences/ ":http://www.research.att.com/~njas/sequences/]
# ["http://www.ics.uci.edu/~eppstein/junkyard/euler/ ":http://www.ics.uci.edu/~eppstein/junkyard/euler/]

# acm.uva.es
# ipsc.ksp.sk
# algoritmus.org/index.php
# http://www.research.att.com/~njas/sequences/ ["aici":http://www.research.att.com/~njas/sequences/]
# http://www.ics.uci.edu/~eppstein/junkyard/euler/