Garside, GR and Pintelas, PE "An ALGOL 68 package for implementing graph algorithms" pp. 237-242

(1980) The Computer Journal 23(3) 1980  

Languages mentioned ALGOL 68 {1968} 3rd generation ALGOL FGRAAL {1972} Fortran Graph extensions GASP {1969} PL/I extension for programming graph algorithms GEA {1968} Graph Extended ALGOL GRAAP {1976} GRaph Algorithmic Applications Package GRASPE {1968} GTPL {1970} Graph-theoretical extensions to Fortran