added references
added references

rahul0208/52-technologies-in-2016,shekhargulati/52-technologies-in-2016,shekhargulati/52-technologies-in-2016,shekhargulati/52-technologies-in-2016,rahul0208/52-technologies-in-2016,rahul0208/52-technologies-in-2016,rahul0208/52-technologies-in-2016,rahul0208/52-technologies-in-2016,shekhargulati/52-technologies-in-2016,rahul0208/52-technologies-in-2016,shekhargulati/52-technologies-in-2016,shekhargulati/52-technologies-in-2016,shekhargulati/52-technologies-in-2016,rahul0208/52-technologies-in-2016