Fix documentation

Author: haochey

docs/documentation/case.md

@@ -576,7 +576,7 @@ Details of the transducer acoustic source model can be found in [Maeda and Colon
 
 - `%%loc(j)` specifies the location of the acoustic source in the $j$-th coordinate direction. For planer support, the location defines midpoint of the source plane. For transducer arrays, the location defines the center of the transducer or transducer array (not the focal point; for 3D it's the tip of the spherical cap, for 2D it's the tip of the arc). 
 
-- `%%pulse` specifies the acoustic wave form. `%%pulse = 1`, `2`, `3` and `4` correspond to sinusoidal wave, Gaussian wave, square wave and broadband wave, respectively.
+- `%%pulse` specifies the acoustic wave form. `%%pulse = 1`, `2`, `3` and `4` correspond to sinusoidal wave, Gaussian wave, square wave and broadband wave, respectively. The implementation of the broadband wave is based on [Tam (2005)](references.md#Tam05)
 
 - `%%npulse` specifies the number of cycles of the acoustic wave generated. Only applies to `%%pulse = 1 and 3` (sine and square waves), and must be an integer for non-planar waves.
 

src/common/m_constants.fpp

@@ -26,7 +26,7 @@ module m_constants
     real(kind(0d0)), parameter :: acoustic_spatial_support_width = 20d0 !< Spatial support width of acoustic source, used in s_source_spatial
     real(kind(0d0)), parameter :: dflt_vcfl_dt = 100d0 !< value of vcfl_dt when viscosity is off for computing adaptive timestep size
 
-    !< Broadband acoustic source constant (reference: Tam et al. JSV 2004 )
+    !< Broadband acoustic source constant (reference: Tam et al. JSV 2005)
     integer, parameter :: num_broadband_freq = 100 !< The number of sine wave frequencies in broadband acoustic source.
     real(kind(0d0)), parameter :: broadband_freq_lowest = 500d0 !< The lower sine wave frequency bound in broadband acoustic source.
     real(kind(0d0)), parameter :: broadband_bandwidth = 100d0 !< The bandwidth of the discretized sine wave frequencies.