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Notes:

• Enter your keywords in lower case, separated by blanks.
• use a "+" indicate that a certain term is mandatory and a "-" to indicate a term that should not appear.
  Example: "+feedback +stabilization -passivity" will look for all documents containing the strings feedback and stabilization, but will exclude those mentioning passivity.
• articles, pronouns, etc, are ignored; no accents are needed; AMS classification codes are recognized.
• Wildcards:
  • "*" for any string (so "stabili*" matches stability, stabilization, stabilizability, etc)
  • "?" stands for 0 or 1 character
  • "!" for exactly one character ("L!apuno*")
  • "{}" is used for choices (so "stabili{ty,zation}" matches stability and stabilization, but not stabilizability)