Proof of expression

In dw1000 User Manual in page 227 :

"The resultant time-of-flight estimate, Tprop, in both the three and four message cases may be calculated using the expression:

Tš‘š‘Ÿš‘œš‘ = (š‘‡š‘Ÿš‘œš‘¢š‘›š‘‘1 Ɨ š‘‡š‘Ÿš‘œš‘¢š‘›š‘‘2 āˆ’ š‘‡š‘Ÿš‘’š‘š‘™š‘¦1 Ɨ š‘‡š‘Ÿš‘’š‘š‘™š‘¦2) /(š‘‡š‘Ÿš‘œš‘¢š‘›š‘‘1 + š‘‡š‘Ÿš‘œš‘¢š‘›š‘‘2 + š‘‡š‘Ÿš‘’š‘š‘™š‘¦1 +š‘‡š‘Ÿš‘’š‘š‘™š‘¦2)"

Where can I find the proof of this expression?

Iā€™m not exactly sure where I got this from, but section 1.2 gives the proof.
The-mathematics-of-two-ADSTWR.pdf (437.8 KB)
It looks to be based on this (warning, .doc file)

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This expression was also published by Neirynck et al. here:

They also give the analysis on clock drift error (and compare it to SDS-TWR).