References
- GerardButtersFrederickHenleJamesHenleColleenMcGaugheyCreating clueless puzzlesMath. Intelligencer332011102107
- SoniaBrownJamesHenleChristineNiccoliBaylaWeickBlank sudokuMAA Focus33201327
- BélaBollobásExtremal Graph Theory LMS Monographs vol. 11 (1980) Academic Press. London, New York, San Francisco.
- A.KotzigA.RosaMagic valuations of finite graphsCanad. Math. Bull.131970451461
- N.HartsfieldG.RingelPearls in Graph Theory A Comprehensive Introduction (1990) Academic Press, Inc.. Boston, MA.
- J.SedáčekOn magic graphsMath. Slov.261976329335