The phrase "additional alternatives" is correct and usable in written English.
It can be used when discussing extra options or choices that are available beyond what has already been mentioned.
Example: "In addition to the current solutions, we should consider additional alternatives to address the issue more effectively."
Alternatives: "further options" or "extra choices".
In a statement, the United States Environmental Protection Agency said it had recently approved some of the new climate-friendly gases for car air-conditioning and refrigerators and is "evaluating additional alternatives for other air-conditioning applications," most notably a newer HFC variant called R32.
This can be performed without having to redefine sub-goals or ontologies, or making additional rules regarding additional alternatives.
Additional alternatives are generated by replacing head constituents and their modifiers by synonymous words, and then following the same over-generation rules described above.
Additional alternatives to address default include pure workforce reduction to increase the revenue per employee and decrease costs, as well as resorting to low-cost country workers or introducing flexible employment models (Taplin and Winterton 1995).
"That's going to give a tremendous opportunity to our bankers to reach out... and give those clients additional alternatives," said Russell D. Goldsmith, the chief executive.
We also explored additional alternatives (see Benchmarking the performance of ngs.plot section).
Any additional alternative forms are numbered sequentially.
Three decades later, Darwin presented an additional alternative.
Consequently, additional alternative imaging would not be expected of any incremental benefit.
For comparison, an additional alternative sanitation system is proposed in this analysis (System III).
An additional alternative, somewhere in the middle between the two previous approaches, is computer simulation.
