 If formula_6 and formula_7 are independent random variables that are variance-gamma distributed with the same values of the parameters formula_8 and formula_9, but possibly different values of the other parameters, formula_10, formula_11 and formula_12 formula_13, respectively, then formula_14 is variance-gamma distributed with parameters formula_8, formula_9, formula_17 and formula_18.The variance-gamma distribution can also be expressed in terms of three inputs parameters (C,G,M) denoted after the initials of its founders.If the "C", formula_19 here, parameter is integer then the distribution has a closed form 2-EPT distribution.