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References to other documents may be specific or non-specific. All references, specific and non-specific, shall be given in the "References" clause (see subclause 6.2.2).
6.6.6.5.2    Specific references
Except as provided for in 6.6.6.5.3, references shall be specific (identified by date of publication, edition number, version number, etc.).
Use the following forms:
-    " … in accordance with 3GPP TS 21.299, clause 3, … ";
-    " … in accordance with [n], clause 3, … ";
-    " … in accordance with 3GPP TS 21.299 [n], clause 3, … ".

6.6.6.5.3    Non-specific references
Non-specific references may be made only in the following cases:
-    if it is accepted that it will be possible to use future changes of the document referred to for the purposes of the referring 3GPP TS or 3GPP TR;
-    if it is granted that the structure of the document referred to will not change for the specific locations which are used by the referring 3GPP TS or 3GPP TR (e.g. the referred to document is controlled by the same TSG as the referring one).

Use the forms as in 6.6.6.5.2.
6.6.6.6    Numbering
References in clause 2 shall be numbered sequentially. If a reference is removed when a specification is under change control, the entry in clause 2 shall be replaced by a [void] entry, using the same principle as for deletion of clauses and subclauses.
-    You may use sequence fields for automatically numbering references. See clause H.4: "Sequence numbering".
6.6.7    Representation of numbers and numerical values

The decimal sign shall be a comma. The thousand separator shall be a space.
NOTE:    In the text below, ° represents the non-breaking space character.
If a value less than 1 is written in decimal form, the decimal sign shall be preceded by a zero.
EXAMPLE 1:    0,001 (not ,001)
Each group of three digits reading to the left or to the right of a decimal sign shall be separated by a space from preceding digits or following digits respectively, except for four-digit numbers designating years.
EXAMPLE 2:    23°456 / 2°345 / 2,345 / 2,345°6 / 2,345°67 but the year 1997

For clarity, the symbol  or a lower case x (rather than a point or any other symbol) shall be used to indicate multiplication of numbers and numerical values.
EXAMPLE 3:    write 1,8°°10-3 (not 1,8 * 10-3 or 1,8  10-3 or 1,8 . 10-3)
To express numbers of items (as opposed to numerical values of physical quantities), the numerals one to nine shall be spelt out in full.
EXAMPLE 4:    "Carry out the test on five tubes, each 5 m long."
EXAMPLE 5:    "Select a further 15 tubes for the pressure test."

Preserve document identities as in the original titles.
EXAMPLE 6:    ISO/IEC°10531-1 (not ISO/IEC 10°531-1).
EXAMPLE 7:    3GPP°TR°21.801.
Put a non-breaking space between a number and its unit - including the percent sign (%) - even if the unit is not abbreviated:
EXAMPLE 8:    2ºpages        4ºseconds        15º%
Write a number preceded by an unary operator (sign) without an intervening space:
EXAMPLE 9:    … a level of -3°dB …

Put a non-breaking space both before and after binary operators (, , , etc.):
EXAMPLE 10:    a°+°b°=°c
-    Use non-breaking spaces (Ctrl + Shift + space) for the thousand separator, before and after binary operators and preceding units.
-    Use a non-breaking hyphen (Ctrl + Shift + -) for the minus sign.

6.6.8    Quantities, units, symbols and signs
The units in which any values are expressed shall be indicated.

6.6.9    Mathematical formulae
6.6.9.1    Types of equations
Equations between quantities are preferred to equations between numerical values. Equations shall be expressed in mathematically correct form, the variables being represented by letter symbols the meanings of which are explained in connection with the equations, unless they appear in a "Symbols and abbreviations" clause (see subclause 6.3.2). Descriptive terms, acronyms or names of quantities shall not be arranged in the form of an equation.
EXAMPLE:

where:    xj are samples of time errors data;
    N is the total number of samples;
     is the time error sampling interval;
    n is the number of sampling intervals, with n = 1,2,...,integer part (N/3).