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Sample 1

Hello world!

Something else.

[math]\int_0^\infty e^{-x} dx[/math] This works fine

Note. $1+1=2$ If I give a name or number to the parameter, math comes out just fine.

However, it bothers me that I cannot put two separate paragraphs inside a note.

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References

• Gilbarg, David; Trudinger, Neil S. (2001), Elliptic partial differential equations of second order (2nd ed.), Berlin, New York: Springer-Verlag, ISBN 978-3-540-41160-4 

Sample 2: Inline references

This is a citation.