For example The special functions and their approximations (1969) and two further volumes Mathematical functions and their approximation (1975) and Algorithms for the computation of mathematical functions (1977) contain a beautiful survey of the areas on which he worked.
Halimbawa Ang espesyal na pag-andar at ng kanilang mga approximations (1969) at dalawang volume na matematiko karagdagang function at ang kanilang mga approximation (1975) at algorithm para sa pagtutuos ng mga matematiko function (1977) maglaman ng isang beautiful survey ng lugar kung saan siya nagtrabaho.