# Use formula for the integration of the product of 3 MeijerG function?

GROUPS:
 I am trying to use the formula for the integration of the product of 3 MeijerG functions in the following link: http://functions.wolfram.com/HypergeometricFunctions/MeijerG/21/02/04/0001/However, the following remark is mentioned in ( http://functions.wolfram.com/HypergeometricFunctions/MeijerG/21/ShowAll.html ) :Remark: This relationship only holds true when the parameters satisfy certain well-specified restrictions.what is the reference for this sentence to be able to use the conversion in the formula? Thank you in advance