Brad Minch's "Emitter Follower with Current Source Bias VTC" lectures:
Idealized Analysis:    • Emitter Follower with Current Source ...  
Effects of Finite Beta and Early Voltage:    • Emitter Follower with Current Source ...  

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0:00 -- Introduction
2:27 -- Ebers-Moll model
3:59 -- Early effect
5:02 -- Taylor series, backwards!
5:51 -- Sigma notation
6:41 -- Equating currents
8:08 -- Taking logarithms
9:31 -- Rearranging terms
10:38 -- Complete answer
11:19 -- Simplifying assumptions
11:58 -- Simplified answer
12:57 -- Lower limit on input voltage
14:19 -- Temperature variations
14:52 -- Rant
17:08 -- Brad Minch