Is there literature that discusses application of univariate and bivariate spectral analysis and explaining the formulas?

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Ernest O Nnadi

You may find the following useful:

http://www.tandfonline.com/doi/abs/10.1080/02626669509491436#.VQxNYGdyaUk

http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.399.9290&rep=rep1&type=pdf

http://www.sciencedirect.com/science/article/pii/S0022169409006635

Amro Mohamed Elfeki

You may see this lecture:

https://www.researchgate.net/publication/236885838_Representation_of_Stochastic_Processes_in_Real_and_Spectral_Domains_and_Monte-Carlo_sampling

also this paper:

https://www.researchgate.net/publication/258880473_Analysis_of_Annual_Rainfall_Climate_Variability_in_Saudi_Arabia_by_Using_Spectral_Density_Function

and this presentation:

https://www.researchgate.net/publication/235954988_Icwrae_Conference_Presentation_2013

good luck,

Amro Elfeki

Data Representation of Stochastic Processes in Real and Spectral ...

Article Analysis of Annual Rainfall Climate Variability in Saudi Ara...

Data Icwrae Conference Presentation 2013

Gianpiero Amanzio

Thanks Ernest O Nnadi and Amro Mohamed Elfeki for your advice. I will read the material carefully.