The journal Briefings in Bioinformatics, whose latest impact factor is 9.283, published a special issue titled 'Orthology and Applications'. This issue includes an obituary for Walter M. Fitch who passed away in March this year, focusing on his milestone of providing the idea of orthology and paralogy for the first time in his paper in 1970 (see below).
|The 1st page of the paper by Fitch (1970) introducing the concept of orthology and paralogy (Systematic Zoology. 19: 99-113)|
(please also another obituary for W.M. Fitch in Science)