I am a beginner in statistics so I would like some help with literature. I have a linear model $Y= b_0 + b_1 X^2$ Intercept $b_0$ is not significant (sig: 0,09 > 0,05) but $b_1$ is very significant. I cannot find any literature to support the fact that it is not a big problem for the intercept being zero and also I am not sure I am right.
I understand there's another similar question but I wonder if anyone has an official paper or book that, states the answer to my question. I haven't found something answering exactly that.