[1] Balakrishnan, R. and Ranganathan, K. (2012) A Textbook of Graph Theory. Springer, Berlin.
http://dx.doi.org/10.1007/978-1-4614-4529-6
[2] Alspach, B., Heinrich, K. and Liu, G. (1992) Orthogonal Factorizations of Graphs. In: Dinitz, J.H. and Stinson, D.R., Eds., Contemporary Design Theory, Chapter 2, Wiley, New York, 13-40.
[3] Gronau, H.-D.O.F., Hartmann, S., Grüttmüller, M., Leck, U. and Leck, V. (2002) On Orthogonal Double Covers of Graphs. Designs, Codes and Cryptography, 27, 49-91.
http://dx.doi.org/10.1023/A:1016546402248
[4] Colbourn, C.J. and Dinitz, J.H. (eds.) (2007) Handbook of Combinatorial Designs. 2nd Edition, Chapman & Hall/CRC, London, Boca Raton.
[5] Colbourn, C.J. and Dinitz, J.H. (2001) Mutually Orthogonal Latin Squares: A Brief Survey of Constructions. Journal of Statistical Planning and Inference, 95, 9-48.
http://dx.doi.org/10.1016/S0378-3758(00)00276-7
[6] El-Shanawany, R. (2002) Orthogonal Double Covers of Complete Bipartite Graphs. Ph.D. Thesis, Universitat Rostock, Rostock.
[7] Sampathkumar, R. and Srinivasan, S. (2009) Mutually Orthogonal Graph Squares. Journal of Combinatorial Designs, 17, 369-373.
http://dx.doi.org/10.1002/jcd.20216
[8] El-Shanawany, R., Gronau, H.-D.O.F. and Grüttmüller, M. (2004) Orthogonal Double Covers of Kn,n by Small Graphs. Discrete Applied Mathematics, 138, 47-63.
http://dx.doi.org/10.1016/S0166-218X(03)00269-5
[9] El-Shanawany, R., Shabana, H. and ElMesady, A. (2014) On Orthogonal Double Covers of Graphs by Graph-Path and Graph-Cycle. LAP LAMBERT Academic Publishing.
https://www.lappublishing.com/