Survey

[1] Ertel1998

[2] Martin1999

Outdoor

[3] Klein1996

[4] Pedersen2000

[5] Kavak2000

[6] Cheon2001

[7] Algans2002

Microcell

[8] Dottling1997

Indoor-Outdoor

[9] Woodward1999

Indoor

[10] Spencer2000

[11] Zwick2002

Unified Models

[12] Tameh1997

[13] Fuhl1998