The "paper" you might be recalling is likely their influential 2014 journal article, published in Acta Arithmetica , which laid the groundwork for the later book.
: " Exponential Diophantine Equations " by T.N. Shorey and R. Tijdeman is a foundational text focusing on the Gelfond-Baker theory. Effective Results and Methods for Diophantine E...
: The paper "Effective diophantine approximation on Gm" provides deeper insights into the underlying approximation theory used to solve these equations. The "paper" you might be recalling is likely
: Using linear forms in logarithms of algebraic numbers to find explicit bounds. published in Acta Arithmetica
: Applying effective results from algebraic geometry and commutative algebra. Related Essential Readings