Analysis of information sources in references of the Wikipedia article "Gravitational field" in Simple English language version.
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: CS1 maint: numeric names: authors list (link) Chapter 7, page 181{{cite book}}
: CS1 maint: multiple names: authors list (link) CS1 maint: numeric names: authors list (link) Chapter 10, page 256{{cite book}}
: CS1 maint: numeric names: authors list (link) Chapter 2, page 55