Xiao, Z. (2012). A Combinatorial Note for Harmonic Tensors. International Journal of Mathematics and Mathematical Sciences, 2012(), 575-581-042. https://doi.org/10.1155/2012/316389
Chen, B. Y., & Wei, S. S. W. (2009). p-Harmonic Morphisms, Cohomology Classes and Submersions. Tamkang Journal of Mathematics, 40(4), 377-382. https://www.airitilibrary.com/Article/Detail?DocID=00492930-200912-201012230067-201012230067-377-382