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| multiplying the first equation by (p, the second by q; adding the relating equations and integrating; we obtain, after simplifying the right-hand term in the same way as in Sect.3) | |||
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| multiplying the first equation by (p, the second by q; adding the relating equations and integrating; we obtain, after simplifying the right-hand term in the same way as in Sect.3) | |||