| Approach (last name, year) | Reference | VT | DWLT | | |
| (Blaschka, 2000) | [2] | | | | | (Abello and Martín, 2003) | [3] | | | | | (B̧ebel et al., 2004) | [4] | | | | | (Koncilia, 2003) | [7] | | | | | (Sarda, 1999) | [13] | | | | | (Ravat and Teste, 2000) | [14] | | | | | (Bruckner et al., 2001) | [15] | | | | | (Blaschka, 1999) | [17] | | | | | (Marotta, 2000) | [18] | | | | | (Letz et al., 2002) | [19] | | | | | (Kaas et al., 2004) | [20] | | | | | (Rechy-Ramírez and Benítez-Guerrero, 2006) | [21] | | | | | (Bliujute et al., 1998) | [29] | | | | | (Malinowski and Zimanyi, 2006) | [32] | | | | | (Rizzi, 2007) | [34] | | | | | (Golfarelli et al., 2004) | [35] | | | | | (Eder et al., 2003) | [36] | | | | | (Body et al., 2003) | [37] | | | | | (Vaisman, 2001) | [38] | | | | | (Vaisman et al., 2004) | [39] | | | | | (Pedersen et al., 2001) | [40] | | | | | (Mendelzon and Vaisman, 2000) | [41] | | | | | (Chamoni and Stock, 1999) | [42] | | | | | (Hurtado et al., 1999) | [43] | | | | | (Solodovnikova, 2007) | [44] | | | | |
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