Abstract
The nonperturbative analytical approximation method known as the SFA (Strong-Field Approximation) is traced to its roots in the early days of strongfield physics. Although the SFA is now the primary analytical method used in practice, several departures from the appropriate rules of application have arisen that needlessly restrict the broad power of the SFA. These include matters such as the use of intensity parameters and rules of scaling, and the often-inappropriate use of tunneling and multiphoton concepts. Extensions to momentum distributions and to the relativistic SFA are discussed briefly.
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